Skip to Main Content

Idaho State University

Lake Idaho and Lake Bonneville

Description Registration

Most of us have heard of the Bonneville Flood, but Lake Idaho, which occupied the western Snake River Plain from perhaps 12 to 13 million years ago, has lots of secrets. Fossils abound at Hagerman Fossil Beds, including the Idaho State Fossil, the miniature 3-foot-tall Hagerman Horse. And of course, Lake Bonneville was also a big deal, submerging the Wasatch Front by 1000 feet. We might even talk about fossil fish.