Sentinel Gap on Columbia River

Sentinel Gap Looking South from Frenchman’s Spring Coulee

This image was taken from the bottom of Frenchman’s Spring Coulee near where it enters the Columbia River.  Sentinel Gap was cut across the Saddle Mountains by the Columbia River and the Ice Age Floods.  During the floods, the Columbia River was at a level near the top of the eastern slope of the Gap.  On the north side of the Gap, the Vantage Bridge and Wanapum Dam are faintly visible.  Through the Gap, Umatilla and Rattlesnake Ridges are visible.  And of course, the clouds make the image.

 

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