Island Park Reservoir

About Island Park Reservoir

Island Park Reservoir which is formed by Island Park Dam is a major feature of the Mindoka Project. Recreation on this 11 square mile (7,000-acre) reservoir with 64 miles of shoreline is administered by the Targhee National Forest. Located in the high country of eastern Idaho, north of Idaho Falls. At Island Park Reservoir, fishing season is year-round for rainbow trout, cutthroat trout, coho salmon, yellow perch, and bluegill. The Island Park area offers excellent trout fishing at Island Park Reservoir and along the Henry's Fork,Buffalo River, Warm River, Fall River and Bitch Creek. Reservoir acre feet and total reservoir capacity and cubic feet/second release rates for rivers below Upper Snake River Basin reservoirs and select river locations are updated daily and graphically provided. Season open year-round. Boat ramp elevations.

How to Get There

Directions: Located immediately west of U.S. 20, between Ashton and Big Springs.

Plan Your Visit to Island Park Reservoir

Heading to Island Park Reservoir? A few things to know before you go:

• Reservations: popular sites fill up fast — check Recreation.gov 6 months in advance
• Fees: day-use and camping fees vary; check current rates on the official park page
• Trash & pack-out: follow Leave No Trace principles
• Wildlife: store food in bear boxes where provided; never feed wildlife
• Weather: the 5-day forecast above is updated every 6 hours; verify just before you go

References & Official Resources

• Official Recreation.gov page
• View on OpenStreetMap
• Driving directions (Google Maps)