Echo Lake, is the name of a glacial lake located in El Dorado County, California, U.S.A. It is about 2 miles (3 km) off Highway 50 at Echo Summit. The lake is divided into two sections; an Upper lake, and a Lower lake. The elevation of Echo lake is maintained in summer months with a dam at 7,414 feet above sea level . As a natural reservoir, located in a rural part of the state, it has seen relatively little development beyond lakeside cabins.