Table 23 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Upper Willamette River Steelhead, and Dams/Reservoirs Representing the Upstream Extent of Critical Habitat

Hydrologic Unit nameHydrologic Unit numberCounties1 within Hydrologic Unit and within range of ESUDams/ReservoirsLower Columbia-Sandy17080001Clark (WA)Lower Columbia-Clatskanie17080003Clatsop (OR), Columbia (WA), Cowlitz (WA), Wahkiakum (WA)Lower Columbia17080006Clatsop (OR), Pacific (WA), Wahkiakum (WA)Upper Willamette17090003Benton (OR), Linn (OR), Polk (OR)North Santiam17090005Clackamas (OR), Linn (OR), Marion (OR)Big Cliff DamSouth Santiam17090006Linn (OR)Green Peter DamMiddle Willamette17090007Clackamas (OR), Marion (OR), Polk (OR), Washington (OR), Yamhill (OR)Yamhill17090008Lincoln (OR), Polk (OR), Tillamook (OR), Yamhill (OR)Molalla-Pudding17090009Clackamas (OR), Marion (OR)Tualatin17090010Clackamas (OR), Columbia (OR), Multnomah (OR), Tillamook (OR), Washington (OR), Yamhill (OR)Lower Willamette17090012Clackamas (OR), Columbia (OR), Multnomah (OR)1 Some counties have very limited overlap with estuarine, riverine, or riparian habitats identified as critical habitat for this ESU. Consult USGS hydrologic unit maps (available from USGS) to determine specific county and basin boundaries.