Salmon River Ice Jams

by Lester L. Cunningham, US Army Corps of Engineers, Walla, Walla, WA, USA,
Darryl J. Calkins, US Army Corps of Engineers, Walla, Walla, WA, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development


The ice conditions on the river during the freeze-up period and the simple analytical model used to predict the advance of the ice cover leading edge are documented. Ice cover thicknesses in excess of 9 ft (3 m) were measured at cross sections where shoving had occurred. The initiation of the ice cover for this reach of the river begins in a long, deep pool formed by an alluvial fan from Dump Creek that developed in the late 1800's. By improving the flow conveyance through the alluvial fan and increasing the flow velocity in the backwater behind it, the initiation of the freeze-up ice cover could be delayed, thereby delaying the arrival of the leading edge at Salmon, Idaho, and reducing the potential for ice jam flooding.

Subject Headings: Rivers and streams | Ice | Ice jams | Freezing | Alluvial channels | River flow | Floods | High-rise buildings | Idaho | United States

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