Recent history of Bear Lake Valley, Utah-Idaho

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Abstract
Bear Lake Valley, 30 mi. E. of the Bonneville Basin in northern Utah and lying across the Utah-Idaho line, is partly the result of downfaulting along the Bear Lake fault at its eastern margin. Scarplets in alluvium are almost continuous along the trace of the fault. Bear River flows obliquely across the northern end of the valley. The valley is marked by abandoned shorelines of Bear Lake at elevations 6, 15, and 25 ft. above present lake level. Radiocarbon dating of the shorelines indicates that these high stages existed about 8000 years B.P. The highest stage apparently was due to downward movement of the valley, ponding the river. The intermediate stage can be explained by slowed downcutting of the outlet, or perhaps landsliding. The 6-ft. stage is believed due to regrowth of the alluvial fan of Bear River.

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