The Henrys Lake Mountains, highest point Sheep Point, el. 10,609 feet (3,234 m), (See also ) are a small mountain range northwest of West Yellowstone, Montana, in Madison County, Montana. These mountains are also referred to as the Lionhead Mountains, and straddle the Continental Divide along the Idaho-Montana border. On the northwest corner of these mountains is Quake Lake, created when the 1959 Hebgen Lake earthquake caused a massive landslide and dammed the Madison River. Nine subalpine lakes sit in high cirques in the higher reaches, with several peaks topping 10,000'. Coffin Lake is the largest and most popular, on the Montana side. About 32,000 acres are roadless in the Montana portion, with an unknown amount in Idaho. Dense forests, pristine streams, rolling tundra, and grassy parks provide year-round habitat for grizzly bears, elk, and bighorn sheep. Rocks and soils are inherently unstable, a factor in the landslide that caused much loss of life in 1959. The instability exists because the range is basically limestone blocks sitting on top of shale and Yellowstone volcanic rocks.
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Henrys Lake Mountains in the context of Centennial Mountains
The Centennial Mountains are the southernmost sub-range of the Bitterroot Range in the U.S. states of Idaho and Montana. The Centennial Mountains include the Western and Eastern Centennial Mountains. The range extends east from Monida Pass along the Continental Divide to Henrys Fork 48 km (30 mi) NNW of Ashton, Idaho; bounded on the west by Beaver Creek, on the north by Centennial Valley and Henrys Lake Mountains, on the east by Henrys Lake Flat, and on the south by Shotgun Valley and the Snake River Plain. The highest peak in the range is Mount Jefferson.
They are one of only a few ranges within the Rocky Mountains that trend west to east, and the Continental Divide runs along their ridge line.