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