Henrys Lake is a small, shallow alpine lake in the western United States, in eastern Idaho. Approximately 8 square miles (21 km2) in area, at 4 miles (6.4 km) in length and 2 miles (3.2 km) in width, its surface elevation is 6,472 ft (1,973 m) above sea level.
It is on the southwest side of the Henrys Lake Mountains of northern Fremont County, approximately two miles south of the continental divide along the Montana state line, just west of Targhee Pass and north of Sawtell Peak. The lake provides the headwaters of the Henrys Fork, a tributary of the Snake River. The lake lies less than ten miles (16 km) across the continental divide from the headwaters of the Missouri River in southwestern Montana. It is 16 miles (26 km) due west of the western boundary of Yellowstone National Park, located in an enclave of Caribou-Targhee National Forest.A dam built at the outlet of Henrys Lake in 1923 dramatically increased the surface area of the lake.Springs are found around the shoreline at Staley Springs, Pintail Point, Kelly Springs, the Cliffs, and along the northshore of the lake. Inlets are found at Timber Creek, Targhee Creek, Howard Creek, Duck Creek, Hope Creek, and Kenny Creek.
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