Red Rock Pass (Idaho)
Red Rock Pass | |
---|---|
US 91 | |
Location | Bannock County, Idaho, U.S. |
Range | Portneuf Range/ Bannock Range Rocky Mountains |
Coordinates | 42°21′20″N 112°2′40″W / 42.35556°N 112.04444°W |
Location in the United States Located in Idaho |
Red Rock Pass is a low
The pass was cut through resistant Paleozoic shale, limestone, and dolomite, and forms a narrow gap two miles (3 km) in length.[2] At one time the pass was 300 feet (90 m) higher, where the shoreline of Pleistocene Lake Bonneville stood.
The pass takes its name from the red limestone cliffs which border it.[3] Red Rock Pass has a surface deposit of calcareous silty alluvium with topsoil of dark grayish brown silt loam.[4]
Bonneville flood
It is believed that during the last
The Bonneville flood, as it is known, was a catastrophic event. The maximum discharge was about 15 million cubic feet per second (420,000 m³/s), or about three times the average flow of the Amazon River, the world's largest river. The speed of flow was approximately 16 miles per hour (7.2 m/s), and though peak flow lasted only a few days, voluminous discharges may have continued for at least a year.
References
- ^ MSRmaps.com – topo map – Red Rock Pass – accessed 2009-08-19
- ISBN 0-9603566-3-0, p.505
- ^ Rees, John E. (1918). Idaho Chronology, Nomenclature, Bibliography. W.B. Conkey Company. p. 104.
- ^ "SoilWeb: An Online Soil Survey Browser | California Soil Resource Lab". Casoilresource.lawr.ucdavis.edu. Retrieved 2017-04-11.
- ^ Univ. of Utah Media – Lake Bonneville – accessed 2009-08-19
External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- Huge Floods.com – Bonneville
- Idaho State Univ. – Digital Geology of Idaho Archived 2009-03-03 at the Wayback Machine – Lake Bonneville