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Wallula Gap (/ w ə ˈ l uː l ə /) is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington. It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin , just south of the confluence of the Walla Walla and Columbia rivers.
It is named after a large northward bend in the river's otherwise southbound course. Hanford Reach is the only section of the Columbia in the United States that is not tidal nor part of a reservoir, excluding a short reach between the Canada–United States border and the upper end of Franklin D. Roosevelt Lake, the reservoir of Grand Coulee Dam.
Lake Umatilla is a 110-mile (177 km) long [1] reservoir on the Columbia River in the United States, on the border of the U.S. states of Washington and Oregon.It was created in 1971 with the construction of John Day Dam, and stretches upstream to the McNary Dam.
Left tributary Right tributary Length (km) Basin size (km 2) . Average discharge (m 3 /s) . Lower Columbia. Mouth to Bonneville Dam. Youngs: 43 257.6 14.7 Grays: 48 320 15.9 Elochoman
Lake Wallula is a reservoir on the Columbia River in the United States, between the U.S. states of Washington and Oregon. It was created in 1954 with the construction of McNary Dam. It reaches from McNary Dam near the city of Umatilla, Oregon, to the Tri-Cities of Washington.
Near Longview, Washington and the Cowlitz River confluence, the river turns west again. The Columbia empties into the Pacific Ocean just west of Astoria, Oregon, over the Columbia Bar, a shifting sandbar that makes the river's mouth one of the most hazardous stretches of water to navigate in the world. [20]
The Columbia Slough is a narrow waterway, about 19 miles (31 km) long, in the floodplain of the Columbia River in the U.S. state of Oregon.From its source in the Portland suburb of Fairview, the Columbia Slough meanders west through Gresham and Portland to the Willamette River, about 1 mile (1.6 km) from the Willamette's confluence with the Columbia. [5]
McNary Dam is a 1.4-mile (2.2-km) long concrete gravity run-of-the-river dam which spans the Columbia River. It joins Umatilla County, Oregon with Benton County, Washington, 292 miles (470 km) upriver from the mouth of the Columbia. [3] It is operated by the U.S. Army Corps of Engineers' McNary Lock and Dam office.