Near Downey in Bannock County, Idaho — The American West (Mountains)
Red Rock Pass
Covering over 20,000 square miles when it overflowed here about 14,500 years ago, its winding shoreline would have stretched from here to New Orleans if it were straightened out. This pass was deepened considerably when Lake Bonneville began to flow into Snake River. For a time, a torrent several times larger than the Amazon was discharged here. Finally, with a hotter drier climate that slowly emerged about 8,000 years ago, Lake Bonneville gradually disappeared.
Erected by Idaho Department of Transportation. (Marker Number 171.)
Marker series. This marker is included in the Idaho State Historical Society marker series.
Location. 42° 21.258′ N, 112° 2.964′ W. Marker is near Downey, Idaho, in Bannock County. Marker is on U.S. 91 at milepost 30.2 near South Old Oxford Highway, on the right when traveling north. Touch for map. Marker is at or near this postal address: 28136 U.S. Highway 91, Downey ID 83234, United States of America.
Other nearby markers. At least 8 other markers are within 16 miles of this marker, measured as the crow flies. Captain Jefferson Hunt, Soldier, Pioneer, Churchman Bidwell/Bartleson Trail - Small Brook (approx. 12.6 miles away); The Shoshone (approx. 15.7 miles away); The Earth Will Remember (approx. 15.7 miles away); A Battle Becomes a Massacre (approx. 15.7 miles away); Attack at Bia Ogoi (approx. 15.7 miles away); California Volunteers March to the Bear River (approx. 15.7 miles away); Change and Conflict (approx. 15.7 miles away).
Also see . . . The Lake Bonneville Flood -- Idaho State University. Lake Bonneville was the precursor of the Great Salt Lake. The shorelines of this ancient lake can be seen on the higher slopes of the Wasatch Mountains, more than 984 feet above the present level of the Great Salt Lake. Before the catastrophic Bonneville flood, Lake Bonneville covered an area of more than 19,691 square miles. (Submitted on July 19, 2017, by Barry Swackhamer of San Jose, California.)
Categories. • Natural Features • Paleontology • Waterways & Vessels •
Credits. This page was last revised on July 19, 2017. This page originally submitted on July 19, 2017, by Barry Swackhamer of San Jose, California. This page has been viewed 103 times since then and 25 times this year. Photos: 1, 2, 3. submitted on July 19, 2017, by Barry Swackhamer of San Jose, California.