Island Park Reservoir

Area Status: Open
This area is Open

This lake is formed from the Henry's Fork of the Snake River. It is a beautiful lake surrounded by lodgepole pine trees, with fantastic fishing, and located only about 60 miles north of Rexburg. This large reservoir is popular for boating, fishing and water skiing. Visitors may drive across the top of the dam for scenic views of the Centennial Mountains and Box Canyon.

Island Park Reservoir's body of water covers 8,400 acres. Boat ramps/docks are located at Buttermilk Campground, Island Park, Lakeside Lodge, McCrea Bridge Campground, Mill Creek and the West end. Camping is also available at Buttermilk, McCrea Bridge, Mill Creek and West End.

At a Glance

Area Amenities: Boat ramp,Tent camping,Camping trailer,Fee charged for some activities,Picnic tables,Toilets,Parking

Recreation Map

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Lake and Pond Fishing

Fishing season is year-round for rainbow trout, cutthroat trout, coho salmon, yellow perch, and bluegill.

General Info:


The Island Park Reservoir can be accessed by four different ways.  The West End of the reservoir is accessed by driving north on Highway 20 approximately 18 miles and turning left onto the Green Canyon Road (this road also leads to Harriman State Park) and driving another 13 miles on a dirt road to the West End.

You can also drive to Ponds Lodge in Island Park which is ~27 miles north of Ashton, ID on Highway 20.  Just past Ponds Lodge is a turnoff to the left that will lead back to the Island Park Dam and the boat ramp.

The next access is from the Yale-Kilgore Road which takes off of Highway 20 and Elk Creek, ~ 29 miles north of Ashton, ID on Highway 20.  Turn left and drive 1 mile to the Buttermilk Loop Road.  There is also a campground near the boat dock.

If you drive 3 miles down the Yale-Kilgore road and turn left at the McCrea campground there is a boat dock here also.

Fish Species Rainbow Trout, Yellowstone Cutthroat Trout, Brook Trout Kokanee and Whitefish

Water Activities

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Boat ramp
Camping trailer
Picnic tables
Fee charged for some activities
Tent camping
Fire Danger Level: Low
Areas & Activities


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