The Bonneville Flood – A Veritable Debacle

April 11, 2017 @ 7:00 pm
Wenatchee Valley Museum
127 S Mission St
Wenatchee, WA 98801
Susan Freiberg

Wenatchee Valley Erratics Chapter of the Ice Age Floods Institute will meet at 7:00 P.M., Tuesday, April 11 at the Wenatchee Valley Museum, 127 South Mission, Wenatchee.

Jim O’Connor, Portland-based USGS hydrologist, will discuss The Bonneville Flood – A Veritable Debacle. 18,000 years ago, at Red Rock Pass in eastern Idaho, unconsolidated materials gave way to sudden overflow of Glacial Lake Bonneville. One of the largest floods on earth, the Bonneville Flood was a catastrophic outburst, with discharges lasting a year or more.

GK Gilbert first discovered the flood in the 1870s while looking for the outlet of an inland sea that had cut prominent ancient shorelines above Great Salt Lake. His explorations led him to that spillway. Flooding carved canyons, cataract complexes, and built massive boulder bars, all of which help interpret megaflood processes and model hydrodynamics and landscape analysis.

The program is free & open to the public.

See an interview with O’Connor at For overviews of the Ice Age Floods and more information on the Ice Age Floods Institute, please see our website:; and for quadricopter videos of Ice Age features visit

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