Sentinel Gap
Sentinel Gap is a water gap formed by the Columbia River in the Saddle Mountains, near Mattawa in Washington state.[1] 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".[2] During Ice Age floods in which waters from the Channeled Scablands found passage to the Pacific Ocean here and at Wallula Gap,[3] this opening was "repeatedly reamed out, which probably widened and steepened the walls of the gap".[2] Strandlines from the floods can be seen on the basalt walls of the gap.[4][5]
SR 243 runs along the east side of the river through the gap, and the river is spanned by the Beverly Railroad Bridge.[6] The gap is located between the Wanapum and Priest Rapids dams. Priest Rapids, for which the dam was named, are now submerged beneath the dam's reservoir about 4 miles (6.4 km) downstream from Sentinel Gap.
References
[edit | edit source]- ^ U.S. Geological Survey Geographic Names Information System: Sentinel Gap
- ^ a b Bjornstad 2006, p. 242.
- ^ Soehnichsen 2012, pp. 154–155.
- ^ Bjornstad 2006, p. 92.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
Sources
[edit | edit source]- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
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