Subbasin Map Columbia Estuary Grays Elochoman Cowlitz Kalama Lewis Columbia Lower Willamette Washougal Sandy Columbia Gorge Wind Little White Salmon Big White Salmon Hood Klickitat Fifteenmile Columbia Lower Middle Deschutes John Day Umatilla Walla Walla Snake Lower Palouse Tucannon Yakima Crab Columbia Upper Middle Wenatchee Entiat Lake Chelan Methow Okanogan Okanogan Columbia Upper Sanpoil Spokane Pend Oreille Coeur d'Alene Clark Fork Clark Fork Bitterroot Blackfoot Flathead Kootenai Snake Hell's Canyon Asotin Grande Ronde Imnaha Clearwater Salmon Snake Lower Middle Powder Burnt Weiser Snake Upper Middle Snake Upper Middle Payette Malheur Boise Owyhee Snake Upper Snake Headwaters Snake Upper Closed Bruneau