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Wallula Gap
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Wallula Gap 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 Bas
View from northeast in 2008, from Main Street in Wallula
View from northeast in 2008, from Main Street in Wallula
View to the north from about the midway point within the Wallula Gap
View to the north from about the midway point within the Wallula Gap
Twin Sisters: a scabland residual of the Missoula Floods on the east bank of the Columbia River in the Wallula Gap
Twin Sisters: a scabland residual of the Missoula Floods on the east bank of the Columbia River in the Wallula Gap
View from the northern end toward the south within the Wallula Gap
View from the northern end toward the south within the Wallula Gap
Lake Lewis
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Lake Lewis was a large transient lake in the Pacific Northwest region of North America, formed by periodic Missoula Floods along the Columbia River paleocourse between 21,000 and 16,000 years ago.
Wallula Gap
…entering could be discharged as it passed into Lake Condon downstream. As a result, the floods filled the Pasco Basin and formed, for a short period, Lake Lewis. The large volumes of flood water passing through the gap contributed substantially to the erosion of the gap, as is evidenced by the shear walls and…
This figure shows four profiles of Lake Lewis at various flood levels. It illustrates that the lake back flooded several valleys in which the Touchet
This figure shows four profiles of Lake Lewis at various flood levels. It illustrates that the lake back flooded several valleys in which the Touchet Beds were found.
Looking to the West across the Wallula Gap.
Looking to the West across the Wallula Gap.
Touchet beds in the "Little Grand Canyon" near Lowden in the Walla Walla valley. Note distinct layers.
Touchet beds in the "Little Grand Canyon" near Lowden in the Walla Walla valley. Note distinct layers.
Cluster of erratics on Red Mountain shown in the foreground; these were trapped in glacial ice and "rafted in" on the flood of Lake Lewis. In the back
Cluster of erratics on Red Mountain shown in the foreground; these were trapped in glacial ice and "rafted in" on the flood of Lake Lewis. In the background the native basalt, which covers the rest of the mountain ridge, is visible.