This is America's largest mountain lake at such an altitude (7,733 feet). It is approximately 20 miles long and 14 miles wide. The shoreline is in excess of 100 miles. Its average depth is 137 feet, although it reaches down to 320 feet. The cutthroat trout, so named because of the two bright red or orange stripes that slash across its throat, is the only game fish in the lake.