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Columbia River Basin. 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.
The Columbia River cut the Wallula Gap, seen from Main Street in Wallula, Washington. A water gap is a gap that flowing water has carved through a mountain range or mountain ridge and that still carries water today. [1] Such gaps that no longer carry water currents are called wind gaps.
The landscape is extensively eroded, with deep sheer-walled canyons in the Grand Coulee, Moses Coulee, the Wallula Gap, and the Columbia River Gorge. There are giant ripple marks 30 ft (9.1 m) high and gravel bars over 4 mi (6.4 km) long and 300 ft (91 m) high, which would have required extreme currents to form.
The Walla Walla River is a tributary of the Columbia River, joining the Columbia just above Wallula Gap in southeastern Washington in the United States. The river flows through Umatilla County, Oregon, and Walla Walla County, Washington. [1] Its drainage basin is 1,758 square miles (4,550 km 2) in area. [2]
During David Thompson's 1811 voyage down the Columbia River, he camped at the Snake River confluence on July 9, 1811. There he erected a pole and notice claiming the country for Great Britain and stating the intention of the North West Company to build a trading post at the site. View of Wallula Gap from Main Street in 2008
The water remained for a period of weeks before the flood waters drained through Wallula Gap, just southeast of the Tri-Cities area. Lake Lewis reached an elevation of about 1,200 feet (370 m) above sea level (today's sea level) before subsiding. [1] [3] [4] Lake Lewis also flooded the Yakima, Walla Walla, Touchet and Tucannon river valleys. [1 ...
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.
Map all coordinates using OpenStreetMap. ... Umtanum Ridge Water Gap; W. Wallula Gap; Y. Yakima River; Z. Zenkner Valley