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The Wallula Gap was widened about the 14th millennium BC, by the historic flow of the Salmon, Snake, and Columbia rivers combined with the glacial waters that poured across the Channeled Scablands during the Missoula floods. The Wallula Gap constrained the flow such that less than 1/5 of the 800 km 3 (190 cu mi) of water per day entering could ...
Past the Wallula Gap the OWL is identified with the Wallula Fault Zone, which heads towards the Blue Mountains. The Wallula Fault Zone is active, but whether that can be attributed to the OWL is unknown: it may be that, like the Yakima Fold Belt, it is a result of regional stresses, and is expressed only in the superficial basalt, quite ...
View of Wallula Gap from Main Street in 2008. European settlement of the area began in 1818, when the North West Company built Fort Nez Perce at the mouth of the Walla Walla River. The location was chosen to compete with the Hudson's Bay Company for the fur trade in the Pacific Northwest. That site was maintained until 1855.
Wallula Gap is a large water gap through basalt anticlines in the Columbia River basin just south of the confluence of the Walla Walla River and the Columbia River. The Wallula Gap, which has existed for many millions of years, was widened by the prehistoric flow of the Salmon-Snake and Columbia Rivers combined with the glacial waters that ...
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 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.
Name Image Date Location County Ownership Description Boulder Park and McNeil Canyon Haystack Rocks: 1986: Douglas: Federal, state The most illustrative examples of glacial erratics in the United States.
Wallula Gap – Large water gap of the Columbia River through basalt anticlines in the U.S. state of Washington; Grand Coulee – Ancient river bed in the U.S. state of Washington; Moses Coulee – Canyon in the Waterville plateau region of Douglas County, Washington