Table 7 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Puget Sound Chinook Salmon, and Dams/Reservoirs Representing the Upstream Extent of Critical Habitat  


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  • Hydrologic Unit nameHydrologic Unit numberCounties1 within Hydrologic Unit and within range of ESUDams/ReservoirsStrait of Georgia17110002Skagit (WA), Whatcom (WA)Sand Juan Islands17110003San Juan (WA)Nooksack17110004Skagit (WA), Whatcom (WA)Upper Skagit17110005Skagit (WA), Whatcom (WA)Sauk17110006Snohomish (WA), Skagit (WA)Lower Skagit17110007Skagit (WA), Snohomish (WA)Stillaguamish17110008Snohomish (WA), Skagit (WA)Skykomish17110009King (WA), Snohomish (WA)Snoqualmie17110010King (WA), Snohomish (WA)Tolt DamSnohomish17110011Snohomish (WA)Lake Washington17110012King (WA), Snohomish (WA)Landsburg DiversionDuwamish17110013King (WA)Puyallup17110014King (WA), Pierce (WA)Nisqually17110015Pierce (WA), Thurston (WA)Alder DamDeschutes17110016Lewis (WA), Thurston (WA)Skokomish17110017Grays Harbor (WA), Jefferson (WA), Mason (WA)Hood Canal17110018Clallam (WA), Jefferson (WA), Kitsap (WA), Mason (WA)Puget Sound17110019Island (WA), Jefferson (WA), King (WA), Kitsap (WA), Mason (WA), Pierce (WA), Skagit (WA), Snohomish (WA), Thurston (WA)Dungeness-Elwha17110020Clallam (WA), Jefferson (WA)Elwha Dam1 Some counties have very limited overlap with estuarine, riverine, and riparian habitats identified as critical habitat for this ESU. Consult USGS hydrologic unit maps (available from USGS) to determine specific county and basin boundaries.