Island Park Reservoir is located in some of Idaho’s most beautiful and unique country. This 7000 acre reservoir is on U.S. Highway 20, about 30 miles north of Ashton, and only 25 miles west of Yellowstone National Park. The reservoir was constructed in 1938 as an irrigation storage facility, and has added to the diverse fishing opportunities of the area.
Access on the east end of the reservoir near the dam is excellent. Camping facilities, boat ramps and areas for shoreline fishing are all available. West end access is limited to one campground and ramp. Some shoreline fishing is also available in this area.
Trout and kokanee provide the base of the Island Park fishery. Rainbow and rainbow/cutthroat hybrids are the most popular for anglers, with kokanee a close second. Brook trout and whitefish round out the game fish populations. Lahontan cutthroat have been stocked to take advantage of the abundant prey base and to provide a future trophy fishery.