Sage Hen Dam is an earthfill type dam on Sage Hen Creek, in Gem County, Idaho, United States. Its reservoir is called Sage Hen Reservoir and is located in the West Mountains of Boise National Forest between Boise and McCall. The dam is owned by the Squaw Creek Irrigation Company and does not produce electricity. The reservoir is stocked with rainbow and has a native population of redband trout. It also has recreation facilities that include four campgrounds, a boat ramp, and fishing docks.