Yellowstone Lake is the largest body of water in Yellowstone National Park. The lake is 7,732 feet above sea level and covers 136 square miles with 110 miles of shoreline. While the average depth of the lake is 139 ft, its greatest depth is at least 390 ft. Yellowstone Lake is the largest freshwater lake above 7,000 ft in North America.


Yellowstone Lake has native Cutthroat Trout and non-native lake trout. The strict regulations have improved the sizes and numbers of these trout.