The Walla Walla District is located in the Pacific Northwest United States, bounded by the Cascade Mountains and the Northern Rocky Mountains, satellite image (596k. jpg). The Walla Walla District covers 107,000 square miles in six states: Washington, Oregon, Idaho, Wyoming, and small portions of Nevada and Utah. The boundaries of the District (245k jpg) are the watershed of the Snake River, and a portion of the Columbia River Drainage between the Umatilla Bridge just below McNary Dam (River Mile 290.5) and the end of the Lake Wallula backwater that forms behind McNary Dam (River Mile 345.4), with the exception of the Yakima River Basin beyond River Mile 8.5 near Richland, Washington. The headwaters of the Snake River begin near Yellowstone National Park, in Wyoming, pass through southern Idaho, and continue north through Hell’s Canyon (the deepest canyon in North America), the border between Oregon and Idaho. The Snake then passes through southeastern Washington in a westerly arc, and enters the Columbia River near Pasco, Washington.

• Map of Corps-Managed Lakes (1m jpg) in Idaho, Oregon, and Washington.

• Other Regional Information about the Walla Walla District

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