0311Green RiverKing County has monitored water quality in the Green-Duwamish River at five locations. Station 0311 is located in the Lower Green River a few hundred yards upstream from the former outfall at the Renton Junction Bridge on West Valley Road at Highway 1. Sampling occurred from 1970-2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. The Green-Duwamish runs 93 miles from the crest of the Cascade Mountains to Elliot Bay. Major alterations to the river system have occurred in the last century including the diversion of the White, Black, and Cedar Rivers to alternate discharge points. Anadromous salmonids have been blocked from the upper Green River though the lower river supports coho, Chinook, chum, sockeye, and pink salmon. Land use varies considerably throughout the length of the Green-Duwamish River watershed; land in the Upper Green River is almost entirely used for forest production while development intensity generally increases further downstream 0317Green RiverKing County monitors water quality in Springbrook Creek at Station 0317, located near the mouth of the creek at the bridge. Monitoring at this site began in 1971 and continues today. The Springbrook Creek basin encompasses 15,763 acres near the Cities of Kent and Renton. The mainstem flows 12 miles before joining the Black River then ultimately flows into the Green River at river mile 11.0. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of dissolved oxygen and fecal coliform bacteria standards. Springbrook Creek is also listed for bioassessment scores that indicate that biological integrity is degraded. And the creek has a Category 4a listing as part of the Green River TMDL for fecal coliform bacteria. 0321Newaukum Creek-Green RiverKing County monitors water quality in Crisp Creek at two locations. Station 0321 is located at the mouth of the creek at the bridge on Southeast Green Valley Road, west of 212th Place SE. Water quality samples were collected at this site monthly from 1972 to 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. King County resumed regular monitoring in February 2013. Crisp Creek originates from several groundwater springs and a 20-acre bog and runs three miles before reaching the Green River. Its basin covers 3,200 acres and lies between the cities of Black Diamond and Maple Valley in southern King County. The upper reaches of Crisp Creek are forested where the stream traverses through commercial timberlands. Downstream of the commercial timberlands the riparian area becomes wider with mostly deciduous trees. Crisp Creek provides spawning and rearing habitat for coho, chinook, chum and winter steelhead. 0322Newaukum Creek-Green RiverKing County monitors the ecological health of Newaukum Creek at station 0322, which is one mile upstream from the mouth of the creek. Water quality sampling began at the station in 1972 and continues today. The Newaukum Creek basin encompasses 17,800 acres. The creek originates east of Enumclaw Plateau and flows 14 miles before entering the Middle Green River. Land use in the basin has transitioned from historic forested lands to agriculture and now to rural residential. The creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of water temperature, dissolved oxygen, fecal coliform bacteria, and copper standards. This subbasin of the Green-Duwamish watershed is considered to be a major producer of winter steelhead, coho and chinook salmon. Resident and anadromous cutthroat have been observed throughout the basin. 0430Lake Washington-Sammamish RiverKing County has monitored water quality in Lyon Creek at station 0430, located at the bridge inside the Lake Forest Park Civic Club property since 1975. Lyon Creek originates from wetlands in south Snohomish County and flows 3.8 miles through Lake Forest Park, before draining into the northwest corner of Lake Washington. The basin encompasses 2,600 acres. Land use in the basin is roughly fifty percent residential and fifty percent commercial. Much of the watershed was developed in the late 1970s. During the conversion in land use virtually no stormwater retention/detention facilities were constructed to mitigate the effects of greater basin wide total impervious area on the stream system. Lyon Creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen and bacteria standards. 0434Lake Washington-Sammamish RiverKing County monitors water quality in Thornton Creek at station 0434, which is located one block south of Matthews Beach. Monitoring at this station began in 1971 and continues today. The Thornton Creek basin encompasses 7,402 heavily developed acres. The creek flows 15 miles and drains into Lake Washington at Matthews Beach Park. The Thornton Creek drainage has been changed dramatically throughout its history. After being heavily timbered in the late 19th century, farms, orchards, and diaries dominated the area until the mid-20th century. From 1940 to 2000, the population in the Thornton Creek basin quadrupled, growing from 17,500 to 75,400 in the 60 year period. Water quality issues have resulted from this growth; Thornton Creek is on the Washington Department of Ecology’s 303(d) list of impaired waterways for violations of fecal coliform, dissolved oxygen, and temperature standards. 0438Madsen Creek-Cedar RiverStation 0438 is 1.45 River Miles upstream from the mouth at the bridge on Bronson Way. This station replaced station X438 in 2009 which had been located just above where the river enters Lake Washington. From 1972 through 2008 water quality samples were also collected monthly from an upstream station (A438), located at the bridge on East Jones Road at 196th Ave SE. The Upper Cedar River encompasses roughly 79,951 acres and runs 25 miles from Meadow Mountain near Cascade Crest to the Landsburg Diversion Dam. The City of Seattle owns most of this upper basin - upstream of where the City diverts the drinking water supply from the Landsburg Dam. The Lower Cedar River drains 42,240 acres and runs approximately 21.7 miles from below the Landsburg Dam to Lake Washington. 0440Lake Washington-Sammamish RiverKing County monitors water quality in May Creek at station 0440, located at the gaging station near the bridge on Lake Washington Blvd and SE 80th Street. King County has collected monthly water quality samples at this location since 1972. The May Creek basin encompasses roughly 8,960 acres and includes 26 miles of mapped streams, two small lakes, and over 400 acres of wetlands. The upper, eastern portion of the basin is characterized by less dense residential and agricultural development, and includes a significant portion of the undeveloped parkland on Cougar Mountain. The lower, western portion of the basin is inside the Urban Growth Boundary and is primarily dense urban residential development. May Creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of bacteria standards. May Creek supports five species of salmonids. 0442Lake Washington-Sammamish RiverStation 0442 is located near Coal Creek Parkway and 119th Avenue South. Water quality samples were collected monthly at this station began in 1972 and was discontinued in 2009 when budget cutbacks forced King County to reduce the breadth of its water quality monitoring program. Sampling resumed in February 2013. Coal Creek is located along the southern limit of Bellevue. The headwaters of Coal Creek originate in the steep terrain of Cougar Mountain (1400 foot). The creek flows for about 7 miles through a series of steep, narrow ravines before entering Lake Washington at Newport Shores. The drainage basin for the creek is roughly 4,550 acres. Coal Creek is on the Washington Department of Ecology’s 303(d) list, Category 5, for violation of dissolved oxygen standards. 0444Lake Washington-Sammamish RiverKing County has monitored water quality in Kelsey Creek at two locations. Station 0444 is located at the mouth of Kelsey creek at the gaging station located off Interstate 405, under the trestle near the Richards Road exit. Monitoring at station 0444 began in 1977 and continued until 2008 when budget cutbacks forced King County to reduce its water quality monitoring program. Regular monitoring resumed in February 2013. The Kelsey Creek basin includes 19 miles of stream that drain into the east channel of Lake Washington near I-90 and has an area of 10,879 acres. The Kelsey Creek basin is heavily urbanized with less than 7% forest cover. High stormwater flows have caused Kelsey Creek to be rated “fair” for salmonid use, although Chinook, coho, and sockeye salmon have be consistently observed in the basin. Kelsey Creek is listed on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen, temperature, and fecal coliform bacteria standards. 0446Lake Washington-Sammamish RiverKing County has monitored water quality in Juanita Creek at two locations. Station 0446 is located at the USGS gaging station north of Juanita Beach Park. Regular monitoring began in 1975 and continues today. Juanita Creek originates east of Interstate 405 and flows five miles, eventually draining into Lake Washington at Juanita Beach Park. Its basin covers 4,000 acres. Land use in the area has changed rapidly over the last 20 years. In 1981 only 40 percent of the basin was characterized as being "urban/suburban". Since then, much of the area has been developed and the basin is now described as "highly developed". Water quality in Juanita Creek has suffered from development; the creek is on the 2012 Washington Department of Ecology's 303(d) list of impaired streams for violation of water temperature, dissolved oxygen, and fecal coliform bacteria standards. Cutthroat trout and small populations of coho and chinook salmon have been found in Juanita Creek. 0470Swamp CreekKing County has monitored water quality in Swamp Creek at two locations. Station 0470 is located at the USGS Gaging station near Bothell Way and 80th Ave North. Monitoring at this station began in 1972 and continues today. The Swamp Creek basin encompasses 15,000 acres and includes portions of the communities of Lynnwood, Everett, Bothell, and Kenmore. The creek originates south of Everett and flows 10.9 miles before draining into the Sammamish River. The watershed is heavily urbanized with 52% of the watershed area covered by impervious surface compared to just 19% forested. This increased urbanization has resulted in greater intensity and duration peak flows and diminished summer flows. Consequently, over-widening of the stream channel, heavy bank erosion, and steam bed scour has left salmon habitat degraded throughout much of the basin. Swamp Creek is listed as high concern in the 2013 WQI Report, primarily due to high bacteria and low dissolved oxygen concentrations. 0474North CreekKing County has monitored water quality in North Creek at two locations. Station 0474 is located near the mouth of North Creek on the upstream side of the 522 bridge. Monitoring at station 0474 began in 1976 and continues today. The North Creek basin encompasses 19,000 acres and includes Silver Lake, Ruggs Lake, and Thomas Lake. The creek originates within the Everett Mall area and flows 12.6 miles through the City of Mill Creek before draining into the Sammamish River near Bothell. The rapidly urbanizing North Creek basin was already approximately 49 percent impervious surface area in 2002. The headwaters of North Creek were originally dominated by forested wetlands but are currently dominated by commercial and multi-family residential development. The creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of water temperature and dissolved oxygen standards. Chinook, coho, kokanee, and sockeye have been consistently observed in North Creek. 0478Bear Creek-Sammamish RiverKing County has monitored water quality in Little Bear Creek at two stations. Station 0478 is located at the mouth of Little Bear Creek at State Route 522 East, Woodinville Way exit, near the Prairie Market. Monitoring at this location began in 1971 and continues today. Little Bear Creek flows 7.7 miles from Snohomish County to the Sammamish River near Woodinville. The basin encompasses 10,000 acres. The basin remains roughly 40 percent forested, with a current total impervious area of about 37 percent. Little Bear Creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen standards. Coho, sockeye, and kokanee salmon have been consistently observed in the creek. 0484Bear CreekStation 0484 is located approximately one mile upstream of the mouth of Bear creek where it enters the Sammamish River in the City of Redmond. Station 0484 has been sampled by King County since 1971. The county has also sampled two upstream sites on the mainstem of Bear Creek; station C484 is located at bridge number 119A on NE 95th Street (east of Avondale Rd) upstream of the confluence of Evans Creek with Bear Creek, and station J484 (discontinued in 2009) is the furthest upstream site located at the bridge on 133rd (Seidel Rd), east of Bear Creek Rd. Bear Creek, Cottage Lake Creek and Evans Creek are all on the Washington Department of Ecology's (Ecology) 303(d) list, Category 4a, for having an approved TMDL plan for temperature, dissolved oxygen, and fecal coliform bacteria. Bear Creek is approximately 12.4 miles long and the basin is comprised of three sub-basins: Bear Creek at 14,300 acres, Cottage Lake Creek at 8,000 acres, and Evans Creek at 9,800 acres. 0486Bear Creek-Sammamish RiverStation 0486 on the Sammamish River is located at the Marymoor Park Bridge where Lake Sammamish drains into the Sammamish River. King County has monitored water quality at this site since 1971. The river has been dramatically altered throughout its history; before extensive human development in the late 19th century, the Sammamish was a sinuous, low gradient river with broad, swampy floodplains. However, the lowering of the elevation of Lake Washington due to the Chittenden Locks and extensive drainage “improvements” such as channelization and dredging greatly decreased the complexity of the river, shortening its length from 17 to 13.5 miles. The main corridor of the river flows from the Lake Sammamish weir in Marymoor Park and drains into Lake Washington at Kenmore. The Sammamish supports five species of salmonids, though declining water quality trends may threaten these populations. 0631Issaquah CreekIssaquah Creek has been monitored for water quality by King County at three sites. Station 0631 is located near the mouth of the creek at the bridge on SE 56th, east of Lake Sammamish State Park. Water quality sampling at station 0631 began in 1972 and continues today. Issaquah Creek originates along the slopes of Cougar, Squak, Tiger, and Taylor mountains and covers 39,000 acres before draining into Lake Sammamish. Issaquah Creek has been identified as a Regionally Significant Resource Area because of its exceptional fisheries habitat, though the expected population growth within the basin (18% by 2020) could threaten this status. Issaquah Creek is currently listed on the Washington Department of Ecology’s 303(d) list, Category 5, for violation of dissolved oxygen and temperature standards, and Category 4a for fecal coliform bacteria. 0632Issaquah CreekIssaquah Creek has been monitored for water quality by King County at three sites. Station 0631 is located near the mouth of the creek at the bridge on SE 56th, east of Lake Sammamish State Park. Water quality sampling at station 0631 began in 1972 and continues today. Issaquah Creek originates along the slopes of Cougar, Squak, Tiger, and Taylor mountains and covers 39,000 acres before draining into Lake Sammamish. Issaquah Creek has been identified as a Regionally Significant Resource Area because of its exceptional fisheries habitat, though the expected population growth within the basin (18% by 2020) could threaten this status. Issaquah Creek is currently listed on the Washington Department of Ecology’s 303(d) list, Category 5, for violation of dissolved oxygen and temperature standards, and Category 4a for fecal coliform bacteria. 3106Green RiverKing County has monitored water quality in the Green-Duwamish River at five locations. Station 3106 is located at the bridge at Fort Dent Park downstream of the former Renton Treatment Plant outfall. Sampling began in 1970 and continues today. The Green-Duwamish runs 93 miles from the crest of the Cascade Mountains to Elliot Bay. Major alterations to the river system have occurred in the last century including the diversion of the White, Black, and Cedar Rivers to alternate discharge points. The Green-Duwamish River is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of the dissolved oxygen standards, and Category 4a for temperature violations. 0450CCBear Creek-Sammamish RiverStation 0450CC on the Sammamish River is located at NE 145th Street near the City of Woodinville. King County has monitored water quality at this station since 2009. The river has been dramatically altered throughout its history; before extensive human development in the late 19th century, the Sammamish was a sinuous, low gradient river with broad, swampy floodplains. However, the lowering of the elevation of Lake Washington due to the Chittenden Locks and extensive drainage “improvements” such as channelization and dredging greatly decreased the complexity of the river, shortening its length from 17 to 13.5 miles. The main corridor of the river flows from the Lake Sammamish weir in Marymoor Park and drains into Lake Washington at Kenmore. The Sammamish supports five species of salmonids, though declining water quality trends may threaten these populations. A315Mill Creek-Green RiverKing County monitors water quality in Mill Creek at station A315, which is located at the bridge at 68th Ave and South 261st Street. Monitoring at this site began in 1979 and continued until 2008 when budget cutbacks forced King County to reduce its water quality monitoring program. Regular monitoring resumed in February 2013. The Mill Creek basin encompasses 14,000 acres, which includes portions of Kent, Auburn, Algona, and Federal Way. Land use in the Mill Creek watershed consists of forested and residential land in the upper basin, and residential and agricultural in the lower basin. Mill Creek originates from Lake Doloff and Lake Geneva and flows 8.35 miles before entering the Green River. The creek is on Ecology’s 2012 303(d) list for violation of temperature, dissolved oxygen, fecal coliform bacteria, and copper standards. Coho, chum and winter steelhead have been observed spawning in Mill Creek, and juvenile coho, chum, winter steelhead, cutthroat and chinook have been observed in the creek. A319Newaukum Creek-Green RiverKing County has monitored water quality in the Green-Duwamish River at five locations. Station A319 is located upstream of the confluence of Soos Creek at the bridge on Black Diamond Road. Sampling began in 1976 but was discontinued between 2008 and 2014 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. The Green-Duwamish runs 93 miles from the crest of the Cascade Mountains to Elliot Bay. The Green-Duwamish River is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of the dissolved oxygen standards, and Category 4a for temperature violations. A320Big Soos CreekKing County monitors water quality on Soos Creek at four locations. Station A320 is located at the USGS gaging station roughly 300 feet upstream of the hatchery near the mouth of the creek. Monitoring at this site began in 1972 and continues today. The Soos Creek basin encompasses 44,800 acres east of the City of Kent and drains into the Green River. The creek system contains 60 miles of stream, including 4 main tributaries – Covington Creek, Jenkins Creek, Little Soos Creek, and Soosette. The Soos Creek basin is an extensive system of interacting lakes, wetlands and permeable soils that collectively attenuate peak stream flows. However, increasing urban development, particularly in the western half of the basin, has led to increasing water temperature and more dramatic seasonal flow fluctuations. All five species of Pacific Salmon as well as steelhead and coastal cutthroat trout have been observed in the Soos Creek basin. A432Lake Washington-Sammamish RiverKing County monitors water quality in McAleer Creek at station A432, located at NE 170th and Bothell Way NE, just south of Lake Forest Park. Monitoring at this site began in 1976 and continued until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Regular monitoring resumed in February 2013. McAleer Creek originates at Lake Ballinger and flows roughly six miles before draining into the northeast corner of Lake Washington just south of Lyon Creek. The drainage basin is approximately 5,700 acres in size and includes portions of Mountlake Terrace, Shoreline, and Lake Forest Park. Land use in the basin is mostly developed for residential use. There is also a golf course, shopping center, and a section of Interstate 5 within the basin. McAleer Creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of fecal coliform bacteria and dissolved oxygen standards. Chinook, sockeye, kokanee, and coho salmon, and steelhead, rainbow, and coastal cutthroat trout have been observed in McAleer Creek. A438Madsen Creek-Cedar RiverSampling began at station A438, the upstream site on the Cedar River located at the bridge on East Jones Road at 196th Ave SE, in 1972. Sampling was discontinued from 2008 through 2014 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. The Upper Cedar River encompasses roughly 79,951 acres and runs 25 miles from Meadow Mountain near Cascade Crest to the Landsburg Diversion Dam. The City of Seattle owns most of this upper basin - upstream of where the City diverts the drinking water supply from the Landsburg Dam. The Lower Cedar River drains 42,240 acres and runs approximately 21.7 miles from below the Landsburg Dam to Lake Washington. A456Lake Washington-Sammamish RiverKing County monitors water quality in Forbes Creek at station 0456, which is located near the end of the pump access road on NW 106th Street. Sampling began in 1979 and continued until 2008 when budget cutbacks reduced King County’s water quality monitoring program. However, regular sampling resumed in February 2013. Forbes Creek is short, running only 1.8 miles through the City of Kirkland and a wetland area before draining into the northeast corner of Lake Washington. Its basin contains approximately 1,000 acres of mixed residential landuse. A 29-year (1979 – 2007) trend analysis was conducted with baseflow data collected from Forbes Creek. This analysis showed some improvements in the water quality since 1979. Ortho-phosphorus, total nitrogen, nitrates, total suspended solids, and fecal coliform bacteria have all shown a significant decrease over this 29-year time period. However, stream temperatures and conductivity have increased, and dissolved oxygen concentrations have decreased significantly during the same time period. A499Lake Washington-Sammamish RiverKing County monitored water quality in Yarrow Creek at Station A499, which is located at the mouth of the creek near the intersection of Points Drive and Lake Washington Blvd, 25 feet downstream from the culvert. Monitoring at this site began in 1975 and was discontinued in 2008 due to budget cutbacks. The Yarrow Creek basin encompasses 640 acres. The creek originates in the Bridle Trails State Park and flows 2.95 miles before draining into Lake Washington at the northeastern shoreline. Land use in the basin includes Bridle Trail State Park, a business complex, condominiums, single family residences, and a portion of State Route 520. The creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen and fecal coliform bacteria standards. Little is known about the existing fish population on Yarrow Creek, though the lack of spawning substrate and multiple fish passage barriers are thought to be major limiting factors. A617Lake Sammamish-Sammamish RiverKing County monitors water quality of Lewis Creek at station A617, which is located at a bridge near the intersection of 187th Ave SE and 185th Place SE. Water quality monitoring occurred from 1995 – 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Sampling resumed in 2013. The mainstem of Lewis Creek is short, running just 1.5 miles, but it has numerous branched tributaries. The mainstem originates on the northeast side of Cougar Mountain and drains into the southern end of Lake Sammamish. The basin encompasses 1,209 acres. The dominant land use in the Lewis Creek basin is single family residential and rural residential. Lewis Creek is listed on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen, temperature, and fecal coliform bacteria standards. Several species of salmonids have been observed in the creek below the culvert at I-90, which is a barrier to fish passage. A620Lake Sammamish-Sammamish RiverKing County samples water quality in Idylwood Creek at station A620 at the footbridge in Idylwood Park. Sampling began 1995 and was discontinued in 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Sampling was resumed in February 2013. The creek originates in the City of Bellevue and flows through the City of Redmond before draining into Lake Sammamish 50 feet north of the swimming beach area in Idylwood Park. The creek is on the 2012 Washington Department of Ecology's 303(d) list of impaired streams for violation of dissolved oxygen and fecal coliform bacteria standards. A631Issaquah CreekIssaquah Creek has been monitored for water quality at three sites. Station A631 is located on the mainstem upstream of the state fish hatchery, 30 feet upstream from the bridge on W Underwood Blvd. Sampling began 1972 and was discontinued in 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Sampling resumed in 2013. Issaquah Creek originates along the slopes of Cougar, Squak, Tiger, and Taylor mountains and covers 39,000 acres. More than 75 percent of the basin is forested, with the remainder in wetlands, pastures, and less than 10 percent urban and cleared areas. As of 2001, 30 percent of the basin is zoned forest production, 12 percent is within the urban growth boundary, and the remaining 58 percent is zoned rural. Over 40 percent of the land is in public ownership. Issaquah Creek has been identified as a Regionally Significant Resource Area because of its exceptional fisheries habitat, though the expected population growth within the basin (18% by 2020) could threaten this status. A670Lake Sammamish-Sammamish RiverKing County monitors water quality in Laughing Jacobs Creek at station A670, which is located just upstream from the mouth where the stream crosses East Sammamish Parkway SE. Monthly monitoring began at this site in 2014. Headwaters of the creek flow from Laughing Jacobs Lake through the plateau and into the southeastern shore of Lake Sammamish. The upper portion of the basin is within the City of Sammamish and the lower portion is within the City of Issaquah. This creek contains one of only three consistent spawning populations of late-run Lake Sammamish kokanee. A680Lake Sammamish-Sammamish RiverKing County monitors water quality on Pine Lake Creek at station A680, which is located downstream of the railroad tracks between East Lake Sammamish Parkway and the East Lake Sammamish bike trail. Monitoring at this site began in 1987 and continues today. The Pine Lake Creek basin encompasses 1,175 acres within the City of Sammamish. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations temperature, fecal coliform bacteria, and dissolved oxygen standards. A685Lake Sammamish-Sammamish RiverKing County collects water quality samples in Ebright Creek at Station A685 which is located downstream of the East Lake Sammamish Parkway bridge. Monthly water quality sampling began in 1996 and continued until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. However, sampling in Ebright Creek resumed in February of 2013. High nutrients, high suspended solids, and high fecal coliform bacteria compromise water quality in Ebright Creek. Ebright Creek is listed on the 2012 Washington Department of Ecology’s 303(d) list for violation of fecal coliform bacteria standards. Kokanee, sockeye, chum, and occasionally coho salmon have been observed in Ebright Creek as well as coastal cutthroat and rainbow trout. A687Lake Sammamish-Sammamish RiverKing County collects water quality samples in Zackuse Creek at Station A687 which is located downstream of the East Lake Sammamish Parkway bridge. Monthly water quality sampling began in 2019. It is hoped that recent construction of fish passage friendly culverts and incubation efforts on Zackuse Creek will restore native Kokanee, sockeye, chum, and coho salmon along with pioneering coastal cutthroat and rainbow trout. A690Lake Sammamish-Sammamish RiverKing County began sampling water quality in George Davis Creek (often called Eden Creek) in 1987 at station A690, located at 635 East Lake Sammamish Shore Lane just downstream from the railroad tracks. Sampling was discontinued in 2009 when budget cutbacks forced a reduction in the water quality monitoring program. Sampling resumed again in 2014. The creek is located at the northeast side of Lake Sammamish, within the City of Sammamish in the Inglewood subbasin. Only about 100 feet of George Davis Creek is currently accessible to kokanee and provides potential spawning habitat as the connection between George Davis (Eden) Creek and the lake is highly altered. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of the fecal coliform bacteria standard. AMES_1Harris Creek-Snoqualmie RiverKing County monitors water quality in Ames Creek near the mouth of the creek on the upstream side of NE 100th Street, just east of West Snoqualmie Road. King County has collected regular water quality samples since 2011. The Ames Creek basin encompasses 5,120 acres, including Ames Lake, which is fed by the steep upper section of Ames Creek. Below Ames Lake, the creek descends to the Snoqualmie Valley floor where it flows into the Snoqualmie River. Land use in the basin is dominated by rural residential (70%) and agriculture (30%). There has been heavy alteration in the riparian corridor from agricultural development in the lower reaches and residential development in the upper reaches of Ames Creek. Chinook, coho, and steelhead have been observed in the Ames Creek basin. High water temperature, excess nutrients, and particularly bacteria are water quality concerns in Ames Creek. B319Newaukum Creek-Green RiverKing County has monitored water quality in the Green-Duwamish River at five locations. Station B319 is located upstream of the confluence of Newaukum Creek at the bridge on Southeast Green Valley Road. Sampling began in 1972 and continues today. The Green- Duwamish runs 93 miles from the crest of the Cascade Mountains to Elliot Bay. Major alterations to the river system have occurred in the last century including the diversion of the White, Black, and Cedar Rivers to alternate discharge points. Anadromous salmonids have been blocked from the upper Green River though the lower river supports coho, Chinook, chum, sockeye, and pink salmon. Land use varies considerably throughout the length of the Green-Duwamish River watershed; land in the Upper Green River is almost entirely used for forest production while development intensity generally increases further downstream. B484Bear CreekStation B484 is located at the mouth of Evans Creek just above the confluence with Bear Creek at the bridge on Union Hill Rd (100 yards west of 188th Ave NE). The Evans Creek sub-basin covers 9,800 acres and runs 8.2 miles before joining Bear Creek, which eventually empties into the Sammamish River in the City of Redmond. Water quality samples were collected at this station from 1971 until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Sampling resumed in February 2013. Land use in the watershed has changed markedly in the past 150 years as development in the area has increased. What was once primarily forest has become a mix of forest, grass, and impervious surfaces. Impaired water quality has become a growing concern due to low dissolved oxygen, high temperatures and high nutrients. On occasion, Chinook and sockeye salmon have been observed in Evans Creek. B499Lake Washington-Sammamish RiverKing County monitors water quality at two stations in the Yarrow Creek basin. Station B499, on the main stem of Yarrow Creek, was added in 2017. B499 is located at the bridge on 101st Way Northeast. The Yarrow Creek basin encompasses 640 acres. The creek originates in the Bridle Trails State Park and flows 2.95 miles before draining into Lake Washington at the northeastern shoreline. Land use in the basin includes Bridle Trail State Park, a business complex, condominiums, single family residences, and a portion of State Route 520. The creek is on the Washington Department of Ecology’s 303(d) list, Category 5, for violation of dissolved oxygen and fecal coliform bacteria standards. BB470Swamp CreekKing County has monitored water quality in Swamp Creek at two locations. Station 0470 is located at the USGS Gaging station near Bothell Way and 80th Ave North. Monitoring at this station began in 1972 and continues today. The Swamp Creek basin encompasses 15,000 acres and includes portions of the communities of Lynnwood, Everett, Bothell, and Kenmore. The creek originates south of Everett and flows 10.9 miles before draining into the Sammamish River. The watershed is heavily urbanized with 52% of the watershed area covered by impervious surface compared to just 19% forested. This increased urbanization has resulted in greater intensity and duration peak flows and diminished summer flows. Consequently, over-widening of the stream channel, heavy bank erosion, and steam bed scour has left salmon habitat degraded throughout much of the basin. Swamp Creek is listed as high concern in the 2013 WQI Report, primarily due to high bacteria and low dissolved oxygen concentrations. BSE_1MUDMTNRDBoise Creek-White RiverWater quality samples have been collected monthly by King County since 2015 from one station in Boise Creek. Station BSE_1MUDMTNRD is located near the downstream side of SE Mud Mountain Road in Enumclaw, WA. Boise Creek is part of the Puyallup River Basin in Watershed Resource Inventory Area 10 (WRIA 10). Boise Creek is on the Washington Department of Ecology’s 303(d) list, Category 5, for violation of temperature and pH standards. The Puyallup River Watershed currently has a state approved TMDL plan for fecal coliform bacteria. C320Ravensdale CreekKing County monitors water quality on Soos Creek at four locations. Station C320 is located in Covington Creek on the bridge on Kent-Black Diamond Rd near Thomas Rd. Monitoring at this site began in 1972 and continued until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Regular water quality monitoring resumed in February 2013. The Soos Creek basin encompasses 44,800 acres east of the City of Kent and drains into the Green River. The creek system contains 60 miles of stream, including 4 main tributaries – Covington Creek, Jenkins Creek, Little Soos Creek, and Soosette. The Soos Creek basin is an extensive system of interacting lakes, wetlands and permeable soils that collectively attenuate peak stream flows. However, increasing urban development, particularly in the western half of the basin, has led to increasing water temperature and more dramatic seasonal flow fluctuations. All five species of Pacific Salmon as well as steelhead and coastal cutthroat trout have been observed in the Soos Creek basin. C370Miller Creek-Frontal East PassageKing County has monitored water quality in the Pipers Creek basin at four locations. Station KTHA01 is the furthest upstream location on Pipers Creek located above the Carkeek Park Sewage Treatment Plant. Bacteria has been sampled at this site since the 1970s. The site became part of the routine stream monitoring program in 2016. The Pipers Creek basin encompasses 1,835 highly urbanized acres in the City of Seattle. The creek flows five miles before draining into Puget Sound at Carkeek Park Beach. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of dissolved oxygen standards. Pipers Creek is also listed in Category 4a and has an approved TMDL plan for fecal coliform bacteria exceedances. C446Lake Washington-Sammamish RiverKing County has monitored water quality in Juanita Creek at two locations. Station C446 is located at the bridge on NE 128th, east of 100th NE. Sampling at station C446 occurred from 1976 to 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Juanita Creek originates east of Interstate 405 and flows five miles, eventually draining into Lake Washington at Juanita Beach Park. Its basin covers 4,000 acreas. Land use in the area has changed rapidly over the last 20 years. In 1981 only 40 percent of the basin was characterized as being "urban/suburban". Since then, much of the basin has been developed and the area is now described as "highly developed". Water quality in Juanita Creek has suffered from development; the creek is on the 2012 Washington Department of Ecology's 303(d) list of impaired streams for violation of water temperature, dissolved oxygen, and fecal coliform bacteria standards. Cutthroat trout and small populations of coho and chinook salmon have been found in this stretch of Juanita Creek. C484Bear CreekStation C484 is located on the mainstem of Bear Creek at bridge number 119A on NE 95th Street (east of Avondale Rd) upstream of the confluence of Evans Creek with Bear Creek. There are two other sites on the mainstem of Bear Creek; station J484 is the furthest upstream site located at the bridge on 133rd (Seidel Rd), east of Bear Creek Rd, and station 0484 is located approximately one mile upstream of the mouth of Bear Creek. Bear Creek is approximately 12.4 miles long and the basin is comprised of three sub-basins: Bear Creek at 14,300 acres, Cottage Lake Creek at 8,000 acres, and Evans Creek at 9,800 acres. Bear Creek empties into the Sammamish River on the north side of State Route 520 in the City of Redmond. CHERRY_1Cherry CreekKing County monitors water quality in Cherry Creek at NE Cherry Valley Road. King County began sampling in Cherry Creek in 2011. Approximately 8,320 acres of land drain to the sampling point located just east of Duvall. Cherry Creek drains rural residential developments on the hills that form the east side of the lower Snoqualmie Valley. The creek has been designated as core summer salmonid habitat. High fecal coliform bacteria concentrations are a major water quality concern in the lower part of the basin. D320Big Soos CreekKing County monitors water quality on Soos Creek at four locations. Station D320 is located near the mouth of Jenkins Creek just upstream its confluence with Soos Creek at the bridge on Kent-Black Diamond Rd near 157th Ave SE. Monitoring at this site began in 1972 and continues today. The Soos Creek basin encompasses 44,800 acres east of the City of Kent and drains into the Green River. The creek system contains 60 miles of stream, including 4 main tributaries – Covington Creek, Jenkins Creek, Little Soos Creek, and Soosette. The Soos Creek basin is an extensive system of interacting lakes, wetlands and permeable soils that collectively attenuate peak stream flows. D474North CreekKing County has monitored water quality in North Creek at two locations. In 1999 sampling began at Station D474 located at the bridge on NE 205th near 120th NE. Monitoring was discontinued between 2008 and 2014 when budget cutbacks forced King County to reduce its water quality monitoring program. The North Creek basin encompasses 19,000 acres and includes Silver Lake, Ruggs Lake, and Thomas Lake. The creek originates within the Everett Mall area and flows 12.6 miles through the City of Mill Creek before draining into the Sammamish River near Bothell. The rapidly urbanizing North Creek basin was already approximately 49 percent impervious surface area in 2002. The headwaters of North Creek were originally dominated by forested wetlands but are currently dominated by commercial and multi-family residential development. The creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of water temperature and dissolved oxygen standards and is a high concern in the 2013 WQI Report. F321Newaukum Creek-Green RiverKing County monitors water quality in Crisp Creek at two locations. Station F321 is located upstream of the hatchery inflow near SE 348th and 215th Avenue SE. Routine monthly monitoring began at this site in 1993 and continued until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. In February of 2013, the collection of monthly water quality samples resumed at station F321. Crisp Creek originates from several groundwater springs and a 20-acre bog and runs three miles before reaching the Green River. The upper reaches of Crisp Creek are forested where the stream traverses through commercial timberlands. Downstream of the commercial timberlands the riparian area becomes wider with mostly deciduous trees. G320Big Soos CreekKing County monitors water quality on Soos Creek at four locations. Station G320 is located near the mouth of Little Soos Creek on Covington Way SE, west of the junction with Hwy 516. Monitoring at this site began in 1972 and continued until 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Regular water quality monitoring resumed in February 2013. The Soos Creek basin encompasses 44,800 acres east of the City of Kent and drains into the Green River. The creek system contains 60 miles of stream, including 4 main tributaries – Covington Creek, Jenkins Creek, Little Soos Creek, and Soosette. The Soos Creek basin is an extensive system of interacting lakes, wetlands and permeable soils that collectively attenuate peak stream flows. GRIFFINGriffin CreekKing County samples water quality in Griffin Creek (station GRIFFIN) located along E Griffin Creek Rd NE. Monitoring in this location began in 2011. Approximately 74,880 acres of predominantly forested land drain to the sampling location, though substantial amounts of forest has been cleared for timbering and residential development. The creek flows for approximately 13 miles before draining into the Snoqualmie River. Griffin Creek is also on Ecology’s Category 4a list as part of the Snoqualmie River Watershed Multi-parameter (fecal coliform bacteria specifically) and Temperature TMDLs. HARRIS_1Harris Creek-Snoqualmie RiverKing County monitors water quality in the Harris Creek near Carnation Duvall Rd NE and NE 87th Street. Regular monthly water quality samples have been taken since 2011. The subbasin contains approximately 5,120 acres of land with extensive wetlands, lakes, and ponds. The creek drains into the Snoqualmie River just downstream of John McDonald Memorial Park. The lower end of Harris Creek near the confluence with the Snoqualmie River is considered a “waters of concern” (303(d), Catergory 2) by the Washington Department of Ecology for bacteria. J484Bear CreekStation J484 is the furthest upstream site on the mainstem of Bear Creek and is located at the bridge on 133rd (Seidel Rd), east of Bear Creek Rd. Monitoring at J484 ended in 2017. There are two other sites on the mainstem of Bear Creek; station C484 is located on the mainstem of Bear Creek at bridge number 119A on NE 95th Street (east of Avondale Rd) upstream of the confluence of Evans Creek with Bear Creek, and station 0484 is located approximately one mile upstream of the mouth of Bear Creek. Bear Creek is approximately 12.4 miles long and the basin is comprised of three sub-basins: Bear Creek at 14,300 acres, Cottage Lake Creek at 8,000 acres, and Evans Creek at 9,800 acres. Bear Creek empties into the Sammamish River on the north side of State Route 520 in the City of Redmond. KSHZ06Shell Creek-Frontal Puget SoundKing County has monitored water quality in the Pipers Creek basin at three locations. Station KSHZ06 is located at the mouth of the creek, upstream of the railroad tracks before entering the beach area. Monitoring at this site began in 1988 and continues today. The Pipers Creek basin encompasses 1,835 highly urbanized acres in the City of Seattle. The creek flows five miles before draining into Puget Sound at Carkeek Park Beach. The upper portion of the watershed (approximately 80% of the total watershed area) is an urbanized upper plateau occupied primarily by single-family residences with some small businesses and multifamily housing. Chum and coho salmon have been consistently spotted in Pipers Creek. KTHA01Shell Creek-Frontal Puget SoundKing County has monitored water quality in the Pipers Creek basin at four locations. Station KTHA01 is the furthest upstream location on Pipers Creek located above the Carkeek Park Sewage Treatment Plant. Bacteria has been sampled at this site since the 1970s. The site became part of the routine stream monitoring program in 2016. The Pipers Creek basin encompasses 1,835 highly urbanized acres in the City of Seattle. The creek flows five miles before draining into Puget Sound at Carkeek Park Beach. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of dissolved oxygen standards. Pipers Creek is also listed in Category 4a and has an approved TMDL plan for fecal coliform bacteria exceedances. KTHA02Shell Creek-Frontal Puget SoundKing County has monitored water quality in the Pipers Creek basin at three locations. Station KTHA02 is located just above the confluence of Venema Creek with Pipers Creek. Monitoring at this station began in 1988 but was discontinued between 2008 and 2014 due to budget cutbacks. The Pipers Creek basin encompasses 1,835 highly urbanized acres in the City of Seattle. The creek flows five miles before draining into Puget Sound at Carkeek Park Beach. The upper portion of the watershed (approximately 80% of the total watershed area) is an urbanized upper plateau occupied primarily by single-family residences with some small businesses and multifamily housing. Chum and coho salmon have been consistently spotted in Pipers Creek. KTHA03Shell Creek-Frontal Puget SoundKing County has monitored water quality in the Pipers Creek basin at three locations. Station KTHA03 is located at the mouth of Venema Creek. Monitoring at this station began in 1988 but was discontinued in 2008 due to budget cutbacks. However, regular monitoring was reinstated in February of 2013. The Pipers Creek basin encompasses 1,835 highly urbanized acres in the City of Seattle. The creek flows five miles before draining into Puget Sound at Carkeek Park Beach. The upper portion of the watershed (approximately 80% of the total watershed area) is an urbanized upper plateau occupied primarily by single-family residences with some small businesses and multifamily housing. Chum and coho salmon have been consistently spotted in Pipers Creek. LSIN1Ravensdale CreekKing County monitors water quality in Rock Creek at station LSIN1, which is located near the mouth of the creek where it crosses SE 312th Street. Monthly monitoring began at this site in 2014. Rock Creek is a major tributary to Lake Sawyer with flows from Black Diamond Lake, Jones Lake, and Ginder Lake. The creek enters the southeastern portion of the lake in the Lake Sawyer Regional Park. Almost the entire drainage is in the City of Black Diamond. As part of the Big Soos Creek basin of the Green River watershed, Lake Sawyer serves as a pathway for a late winter run of Coho salmon. Coho salmon travel through Lake Sawyer on their way to spawning grounds in the Ravensdale and Rock Creek systems. LSIN9Ravensdale CreekKing County monitors water quality in Ravensdale Creek at station LSIN9, which is located near the mouth of the creek where it crosses SE 312th Street. Monthly monitoring began at this site in 2104. Ravensdale Creek is a major tributary to Lake Sawyer flowing from Ravensdale Lake through the Henry’s Ridge Natural Area and the Black Diamond Natural Area before entering the southeastern portion of the lake in the Lake Sawyer Regional Park. As part of the Big Soos Creek basin of the Green River watershed, Lake Sawyer serves as a pathway for a late winter run of Coho salmon. Coho salmon travel through Lake Sawyer on their way to spawning grounds in the Ravensdale and Rock Creek systems. MFK_SNQLower Middle Fork Snoqualmie RiverKing County samples for water quality on the Middle Fork Snoqualmie River at station MFK-SNQ located at 428th Ave SE, just upstream from its confluence with the North Fork Snoqualmie River. The Middle Fork originates high in the west slope of the Cascades at Chain Lakes and flows to the west until it meets the North Fork of the Snoqualmie near the town of North Bend. Most of the 108,800 acre drainage area is forested and within the Mt. Baker – Snoqualmie National Forest, though extensive development associated with the towns of Twin Falls, Tanner, and North Bend has taken place in the lowest areas of the watershed. The Middle Fork of the Snoqualmie River is on the Washington State Department of Ecology’s 303(d) list, Category 4a, as part of the Snoqualmie River Watershed Temperature and Multiparameter (specifically fecal coliform bacteria) TMDLs. N484Bear CreekStation N484 is located on Cottage Lake Creek at the downstream side of the bridge on Avondale Road (near NE 151st Street). Monthly water quality samples were collected on Cottage Lake Creek from 1974 to 2008. In February of 2013, regular monthly monitoring resumed. The basin is 8,000 acres, with 6.7 miles of stream length which flow into Bear Creek. In 2007 King County observed statistically significant increasing trends for water temperature, conductivity, total nitrogen, nitrate nitrogen, and total phosphorous and decreasing trends for dissolved oxygen over a 34 year period. These trends are unsurprising given the dramatic development within the basin in the past 50 years and are found in most WRIA 8 streams. A significant reduction in water quality in the Cottage Lake Creek could threaten its high aquatic habitat and salmonid diversity. NFK_SNQTate Creek-North Fork Snoqualmie RiverKing County monitors water quality in the North Fork of the Snoqualmie River at station NFK_SNO located at 428th Ave SE just upstream from its confluence with the Middle Fork Snoqualmie River. Sampling at this site began in 2011. The North Fork drains 66,560 acres of primarily forested land, including a portion of the Alpine Lake Wilderness. The North Fork of the Snoqualmie River is on Washington State Department of Ecology’s 303(d) list, Category 4a, as part of the Snoqualmie River Basin Multi-parameter TMDL. PATTER_3Patterson Creek-Snoqualmie RiverKing County samples for water quality on Patterson Creek near W Snoqualmie River Rd SE. Sampling began at this station in 2011. Patterson Creek originates in several small lakes east of the town of Redmond. The creek flows south along HWY 202 and collects additional drainage from the Issaquah Highlands before flowing into the Snoqualmie River north of the town of Fall City. It drains approximately 12,800 acres. The upper reaches are experiencing rapid development, while the lower reaches flow through mostly agricultural areas. TMDLs for temperature, dissolved oxygen, and bacteria have been developed for the furthest upper and lower reaches of Patterson Creek. RAGING_MTHRaging RiverKing County samples for water quality on Raging River near its confluence with the Snoqualmie River, west of Zurfleuh Boat Launch in Fall City at station RAGING_MTH. Sampling at this site began in 2011. The river begins in the valley formed by Rattlesnake Mountain to the east and Taylor Mountain to the west. The Raging River flows to the northwest towards the community of Preston before turning towards the northeast and eventually draining into the Snoqualmie River at the town of Fall City. The river drains 25,600 acres and is a core spawning area for Snoqualmie River Chinook salmon. The Raging River listed on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of temperature and pH standards. The Raging River is also on Ecology’s Category 4a list as part of the Snoqualmie River Watershed Multi-parameter and Temperature TMDLs. S478Bear Creek-Sammamish RiverKing County has monitored water quality in Little Bear Creek at two stations. In 2002, King County began collecting water quality samples from station S478 at Snohomish 520 Bridge. Sampling was discontinued between 2008 and 2014 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Little Bear Creek flows 7.7 miles from Snohomish County to the Sammamish River near Woodinville. The basin encompasses 10,000 acres. The basin remains roughly 40 percent forested, with a current total impervious area of about 37 percent. Little Bear Creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen standards. Coho, sockeye, and kokanee salmon have been consistently observed in the creek. S484Bear CreekStation S484 is located at 50th Street, upstream from station B484. The Evans Creek sub-basin covers 9,800 acres and runs 8.2 miles before joining Bear Creek, which eventually empties into the Sammamish River in the City of Redmond. Water quality samples were collected at station S484 from 1981 to 2008 when budget cutbacks reduced the breadth of King County’s water quality monitoring program. Sampling resumed in 2014. The Evans Creek valley contains widespread permeable gravel and sand fill, which allows it to absorb much of the water from local storm events. Land use in the watershed has changed markedly in the past 150 years as development in the area has increased. What was once primarily forest has become a mix of forest, grass, and impervious surfaces. Impaired water quality has become a growing concern due to low dissolved oxygen, high temperatures and high nutrients. SFK_SNQLower South Fork Snoqualmie RiverKing County monitors water quality on the South Fork Snoqualmie River at the Snoqualmie Valley Trail just below the North Bend wastewater treatment plant. Sampling began at this station in 2011. The South Fork originates in Snoqualmie Pass at Source Lake and runs 30 miles before joining the mainstem of the Snoqualmie River near the Three Forks Natural Area. It drains 51,840 acres of land, much of which is within the Mount Baker – Snoqualmie National Forest. A small stretch of the South Fork of the Snoqualmie within Twin Falls State Park is listed on the Washington State Department of Ecology’s 303(d) list for impaired waters for low pH. SKYKOMISHUpper South Fork Skykomish RiverKing County monitors water quality of the Skykomish River along Highway 2 just west of the town of Skykomish in northeastern King County. Sampling at this station began in 2011. The Skykomish begins high on the west slope of the Cascade Mountains near Stevens Pass and flows west until it merges with the Snoqualmie River to form the Snohomish River which drains into the Pudget Sound just north of the city of Everett. The drainage area at the sampling station is approximately 170 square miles though the entire Skykomish basin is over 800 square miles. The majority of the upstream area is forested with the town of Skykomish representing the most significant non-forested area. SNQDUVALLPeoples Creek-Snoqualmie RiverKing County monitors water quality in the Snoqualmie River in Duvall a little downstream of NW Woodinville Duvall Rd. Sampling at this station began in 2011. The Snoqualmie River is formed by its North, Middle, and South Forks which drain the west slope of the Cascade Mountains in eastern King County. After the confluence of these steep headwater streams the Snoqualmie enters the broad Snoqualmie River Valley that contains the communities of North Bend, Snoqualmie, Fall City, Carnation, and Duvall as well as significant agriculture operations. As a result, TMDLs for temperature, dissolved oxygen, and bacteria were developed for the Snoqualmie between the confluences of it three forks and the King County sampling station in Duvall. TOLT_MTHStossel Creek-Tolt RiverKing County monitors water quality in the Tolt River just downstream of Tolt Avenue near its confluence with the Snoqualmie River. Water sampling at this station began in 2011. The river drains 64,000 acres of land stretching from the westslope of the Cascades in northern King County to down to its outlet to the Snoqualmie near the town of Carnation. The Tolt River Reservoir, a key component of the regional water supply system, is located on the South Fork of the Tolt River. The Tolt River contains significant spawning areas for the Snoqualmie Chinook salmon. The lowest stretch of the Tolt near the confluence with the Snoqualmie River is considered a “waters of concern” (303(d), Catergory 2) by the Washington Department of Ecology for bacteria. Sampling by King County has revealed a single exceedance of the Extraordinary Primary Contact threshold for fecal coliform in three years of sampling. VA12AVashon IslandStation VA12A in Shinglemill Creek is located just downstream of the SW Cedarhurst Road crossing. The Shinglemill Creek flows from Fisher Pond on the north side of Bank Road to where it empties into Fern Cove on the northwest corner of Vashon. The Vashon-Maury Island Land Trust has acquired properties to control erosion in the drainage basin and now covers the lower third of Shinglemill Creek, its main tributary Needle creek, and much of the surrounding forested land. All of Vashon-Maury Island is designated as rural and as such is outside the urban growth boundary. Low-density residential development covers much of the Island with zoning of one home per five and ten acres. Multifamily, commercial and industrial uses are presently concentrated in the unincorporated town of Vashon and adjacent areas where sewer and other urban services are available. VA37AVashon IslandStation VA65A is located just upstream of the mouth on private property at the end of SW Gorsuch Road on the north east end of Vashon Island. All of Vashon-Maury Island is designated as rural and as such is outside the urban growth boundary. Low-density residential development covers much of the Island with zoning of one home per five and ten acres. Multifamily, commercial and industrial uses are presently concentrated in the unincorporated town of Vashon and adjacent areas where sewer and other urban services are available. VA41AVashon IslandStation VA41A is located just upstream of the Vashon Highway SW crossing between Shawnee Road and 115th Ave SW. Fisher Creek drains into the western shore of Quartermaster Harbor. All of Vashon-Maury Island is designated as rural and as such is outside the urban growth boundary. Low-density residential development covers much of the Island with zoning of one home per five and ten acres. Multifamily, commercial and industrial uses are presently concentrated in the unincorporated town of Vashon and adjacent areas where sewer and other urban services are available. VA42AVashon IslandStation VA42A is located upstream of the mouth of Judd Creek at the SW 225th Street crossing on private property on Vashon Island. Judd Creek was sampled from 2006 through 2008, and then monitoring resumed in 2013. Judd Creek empties into the northwest end of Quartermaster Harbor. All of Vashon-Maury Island is designated as rural and is therefore outside the urban growth boundary. The creek is on the Washington State Department of Ecology’s 303(d) list, Category 5, for violations of temperature standards. Judd Creek is also listed for bioassessment scores that indicate that biological integrity is degraded. VA45AVashon IslandStation VA45A is located near the mouth, downstream of Dockton Road SW just north of the intersection with 75th Ave SW on Maury Island. Mileta Creek empties into the north east end Quartermaster Harbor. All of Vashon-Maury Island is designated as rural and as such is outside the urban growth boundary. Low-density residential development covers much of the Island with zoning of one home per five and ten acres. Multifamily, commercial and industrial uses are presently concentrated in the unincorporated town of Vashon and adjacent areas where sewer and other urban services are available. VA65AVashon IslandStation VA65A is located just upstream of the mouth on private property at the end of SW Gorsuch Road on the north east end of Vashon Island. All of Vashon-Maury Island is designated as rural and as such is outside the urban growth boundary. Low-density residential development covers much of the Island with zoning of one home per five and ten acres. Multifamily, commercial and industrial uses are presently concentrated in the unincorporated town of Vashon and adjacent areas where sewer and other urban services are available. X630Lake Sammamish-Sammamish RiverKing County monitors water quality in Tibbetts Creek at Station X630, which is located near the mouth, at the footbridge crossing over Tibbetts Creek in Sammamish State Park. Monitoring at this site began at station A630 near the State Park entrance in 1975. The monitoring of the creek moved to its current station in 1997 and continues there today; however, from 2008 to early 2013 no water quality samples were taken due to budget cutbacks. Tibbetts Creek is a relatively short creek (4.3 miles long) that originates on Squak Mountain at an elevation of 1,080 feet. The stream flows through a steep headwater area, then in midcourse opens up to a broad flood plain that empties into Lake Sammamish. Tibbetts Creek has been the focus of multiple restoration projects in the last ten years aimed at reducing flooding, alleviating sedimentation, and increasing fish habitat. The creek is on the 2012 Washington Department of Ecology’s 303(d) list for violation of dissolved oxygen and water temperature standards.