Lake DeSmet is located in Johnson County, Wyoming. Water is a precious resource in the arid West. Lake DeSmet, a 3,400 surface acre reservoir constructed for agricultural and industrial storage, holds about 235,000 acre-feet at capacity and has an average depth of 69 feet with a maximum of 120 feet. The reservoir supports an excellent coldwater fishery where rainbow trout dominate the sport fish population with cutthroat trout, brown trout, lake trout, yellow perch, rock bass and walleye. Approximately 35,000 anglers annually fish Lake DeSmet and catch about 60,000 trout.