Island Park Reservoir is a scenic mountain reservoir on the Henry's Fork, built in the late 1930s for irrigation storage. Today it is a favorite for boating, still-water fishing and wide, open views.
Trout and kokanee are the heart of the fishery, and Idaho Fish and Game stocks rainbow trout here. It is a fickle fishery but can produce fish over 20 inches, and fishing is best from a boat. Boat ramps, campgrounds and shoreline fishing spots are spread around the east end near the dam, and the reservoir is popular for ice fishing in winter.
The dam was built during the Depression, and the Civilian Conservation Corps put many Idaho workers on the job.
