Gibson Reservoir, Reservoir in Lewis and Clark National Forest, Montana, United States

Gibson Reservoir is a man-made body of water in the Lewis and Clark National Forest that collects runoff from multiple streams. The shoreline winds through forested and mountainous terrain, creating varied sections where water meets different landscapes.

Construction of Gibson Dam took place between 1926 and 1929 to create storage for agricultural and community water needs. The project represented an important infrastructure development for the region during that era.

The reservoir's name comes from the concrete arch Gibson Dam that holds it back; the dam forms part of the county line between Teton and Lewis & Clark counties. Water arrives via the North Fork Sun River and South Fork Sun River just after the two join, and the reservoir is mainly used for irrigation control.

The area is most accessible during warmer months when mountain roads are clear of snow and passable. Visitors should expect basic conditions and limited services in the surrounding region.

Gibson Reservoir sits on the county line between Teton and Lewis & Clark counties, and its water backs up for about 3 miles between a hilly pass. The reservoir is fed by the North Fork Sun River and the South Fork Sun River just after the two join, and it is mainly used for irrigation control.