Red Rock Pass #171
N 42° 21.262 W 112° 02.968
12T E 413568 N 4689656
This interesting history plaque is located on Highway 91.
Waymark Code: WMBT45
Location: Idaho, United States
Date Posted: 06/19/2011
Views: 8
The Idaho history plaque reads:
RED ROCK PASS
YOU ARE STANDING IN THE OUTLET OF ANCIENT LAKE BONNEVILLE. A VAST PREHISTORIC INLAND SEA, OF WHICH SALT LAKE IS A MODERN REMNANT.
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.
Marker Name: Red Rock Pass
Marker Type: Roadside
Marker Text:
See long description
County: Franklin
City: Preston
Group Responsible for Placement: Utah Pioneer Trails and Landmarks Association
Marker Number: 171
Date Dedicated: Not listed
Web link(s) for additional information: Not listed
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Visit Instructions:
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