Paleomap

At its highest level, 14,500 years ago, Lake Bonneville covered over 40% of the state of Utah.  Most valleys in Utah, below 5090 feet in elevation, were filled with the waters of this large freshwater lake.  (Illustration by USDA)

On a larger scale, Lake Bonneville was part of a system of freshwater lakes that filled valleys across Nevada, California, and Oregon during the Pleistocene Epoch.

To view, a close-up of Utah Valley and Lake Bonneville click here.

(Image by Ken Perry, Chalk Butte Inc.)