660.412—EFH identifications and descriptions for Pacific salmon.

Pacific salmon essential fish habitat (EFH) includes all those water bodies occupied or historically accessible in Washington, Oregon, Idaho, and California in hydrologic units identified in Table 1 of this subpart H. Exceptions include cases in which man-made barriers (dams) identified in Table 1 of this subpart H represent the upstream extent of Pacific salmon access. EFH also includes the marine and estuarine areas shoreward of state boundaries and the Exclusive Economic Zone (EEZ) off the coasts of California, Oregon, and Washington State. To clearly identify watersheds that contain EFH, NMFS uses fourth field hydrologic unit codes (HUCs) developed by the U.S. Geological Survey (USGS) (defined in the Department of the Interior, USGS publication; Hydrologic Unit Maps, Water Supply Paper 2294, 1987). The geographic extent of HUCs range from first field (largest geographic extent) to sixth field (smallest geographic extent). Fourth field HUCs divide the landscape into distinct geographic areas that are identified by eight numbers unique to that hydrologic unit.
[73 FR 60988, Oct. 15, 2008]