Table 21 to Part 226 - Hydrologic Units and Counties Containing Critical Habitat for Snake River Basin Steelhead, and Dams/Reservoirs Representing the Upstream Extent of Critical Habitat

Hydrologic Unit nameHydrologic Unit numberCounties1 within Hydrologic Unit and within range of ESUDams/ReservoirsHells Canyon17060101Adams (ID), Idaho (ID), Wallowa (OR)Hells Canyon DamImnaha17060102Baker (OR), Union (OR), Wallowa (OR)Lower Snake-Asotin17060103Asotin (WA), Garfield (WA), Nez Perce (ID), Wallowa (OR)Upper Grande Ronde17060104Umatilla (OR), Union (OR), Wallowa (OR)Wallowa17060105Union (OR), Wallowa (OR)Lower Grande Ronde17060106Asotin (WA), Columbia (WA), Garfield (WA), Union (OR), Wallowa (OR)Lower Snake-Tucannon17060107Asotin (WA), Columbia (WA), Garfield (WA), Whitman (WA)Palouse17060108Franklin (WA), Whitman (WA)Lower Snake17060110Columbia (WA), Franklin (WA), Walla Walla (WA)Upper Salmon17060201Blaine (ID), Custer (ID), Lemhi (ID)Pahsimeroi17060202Custer (ID), Lemhi (ID)Middle Salmon-Panther17060203Custer (ID), Lemhi (ID)Lemhi17060204Lemhi (ID)Upper Middle Fork Salmon17060205Boise (ID), Custer (ID), Lemhi (ID), Valley (ID)Lower Middle Fork Salmon17060206Idaho (ID), Lemhi (ID), Valley (ID)Middle Salmon-Chamberlain17060207Idaho (ID), Lemhi (ID), Valley (ID)South Fork Salmon17060208Idaho (ID), Valley (ID)Lower Salmon17060209Idaho (ID), Lewis (ID), Nez Perce (ID)Little Salmon17060210Adams (ID), Idaho (ID)Upper Selway17060301Idaho (ID)Lower Selway17060302Idaho (ID)Lochsa17060303Clearwater (ID), Idaho (ID)Middle Fork Clearwater17060304Idaho (ID)South Fork Clearwater17060305Idaho (ID)Clearwater17060306Clearwater (ID), Idaho (ID), Latah (ID), Lewis (ID), Nez Perce (ID), Whitman (WA)Lower North Fork Clearwater17060308Clearwater (ID)Dworshak DamMiddle Columbia-Lake Wallula17070101Benton (WA), Gilliam (OR), Klickitat (WA), Morrow (OR), Sherman (OR), Umatilla (OR), Walla Walla (WA)Middle Columbia-Hood17070105Hood River (OR), Klickitat (WA), Sherman (OR), Skamania (WA), Wasco (OR)Lower Columbia-Sandy17080001Clark (WA), Multnomah (OR), Skamania (WA)Lower Columbia-Clatskanie17080003Clatsop (OR), Columbia (WA), Cowlitz (WA), Wahkiakum (WA)Lower Columbia17080006Clatsop (OR), Pacific (WA), Wahkiakum (WA)Lower Willamette17090012Columbia (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.