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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.
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.
During the floods, flow through the narrow Wallula Gap was restricted such that water pooled in a temporary lake, Lake Lewis, which formed in the lowlands of the Columbia Plateau. Lake Lewis back-flooded up the Yakima, Walla Walla, Touchet and Tucannon River valleys. This flooding lasted for a period of 4–7 days.
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 ...
Looking eastbound on I-82 as it approaches the crest of the Horse Heaven Hills. The Horse Heaven Hills lead eastward from the Simcoe Mountains to Wallula Gap.The range is bounded in the west by Satus Creek near Bickleton, the Columbia River in the east and south, and the anticline ridge that roughly follows the Yakima River in the north.
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.
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
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.