Table 8 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Lower Columbia River Chinook Salmon, and Dams/Reservoirs Representing the Upstream Extent of Critical Habitat

Hydrologic Unit nameHydrologic Unit numberCounties1 within Hydrologic Unit and within range of ESUDams/ReservoirsMiddle Columbia-Hood17070105Hood River (OR), Klickitat (WA), Skamania (WA), Wasco (OR)Condit Dam, The Dalles DamLower Columbia-Sandy17080001Clackamas (OR), Clark (WA), Multnomah (OR), Skamania (WA)Bull Run Dam2Lewis17080002Clark (WA), Cowlitz (WA), Skamania (WA)Merwin DamLower Columbia-Clatskanie17080003Clatsop (OR), Columbia (OR), Cowlitz (WA), Lewis (WA), Skamania (WA), Wahkiakum (WA)Upper Cowlitz17080004Lewis (WA), Pierce (WA), Skamania (WA), Yakima (WA)Lower Cowlitz17080005Cowlitz (WA), Lewis (WA), Skamania (WA)Lower Columbia17080006Clatsop (OR), Pacific (WA), Wahkiakum (WA)Clackamas17090011Clackamas (OR), Marion (OR)Lower Willamette17090012Clackamas (OR), Columbia (OR), Multnomah (OR), Washington (OR)1 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.