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state. The gap is "a water gap where erosion by the
Columbia River was able to keep pace with folding, faulting and uplifting across the Saddle Mountain anticline". During
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runs along the east side of the river through the gap, and the river is spanned by the
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On the Trail of the Ice Age Floods: A Geological Field Guide to the Mid-Columbia Basin
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Lindsey, Kevin (July 25, 1983). "Columbia's early course visible at
Sentinel Gap".
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Ice Age Floods: Glacial Lake
Missoula, Lake Bonneville and the Ice Age Floods
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U.S. Geological Survey
Geographic Names Information System: Sentinel Gap
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from the floods can be seen on the basalt walls of the gap.
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89:. The gap is located between the
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168:Tom Foster (November 7, 2009),
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170:"Sentinel Gap and Mattawa Bar"
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417:. You can help Knowledge by
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383:46.80528°N 119.93389°W
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388:46.80528; -119.93389
274:at Wikimedia Commons
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308:Washington
83:SR 243
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73:Wallula Gap
458:Categories
371:46°48′19″N
310:water gaps
105:References
61:Washington
354:Selah Gap
349:Union Gap
253:910880058
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201:Sources
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