Island Park Reservoir, located in the breathtaking region of eastern Idaho, spans 7,000 acres and is a significant feature of the Caribou-Targhee National Forest. Built in 1938, it provides various recreational opportunities and acts as a storage tank for irrigation, making it a popular tourist and local attraction.
Island Park Reservoir, conveniently located about 30 miles north of Ashton, Idaho, and 25 miles west of Yellowstone National Park, is easily accessible via U.S. Highway 20. This prime location makes it a stress-free stop for those traveling to or from these major destinations​​.
This massive reservoir was created by the Bureau of Reclamation’s 1938 construction of the Island Park Dam on the Henry’s Fork of the Snake River. Initially intended for irrigation, the reservoir has since become a popular spot for recreation. The dam, which provides excellent flood control and irrigation benefits, also created new habitats and fishing opportunities​.
Island Park Reservoir is nestled amidst lodgepole pine forests. It offers stunning scenic views, particularly from the top of the dam, where visitors can gaze upon the Centennial Mountains and Box Canyon. The reservoir’s surroundings are rich in wildlife, providing ample opportunities for birdwatching and nature photography​.
Island Park Reservoir is a hub of outdoor activities throughout the year:
Fishing: The reservoir is renowned for its diverse fish populations, including rainbow trout, cutthroat trout, kokanee salmon, brook trout, and whitefish. Summer and winter fishing are equally popular, with ice fishing attracting aficionados throughout the colder months.
Boating and Water Sports: With five boat launch sites located at Buttermilk Campground, Island Park, Lakeside Lodge, McCrea Bridge Campground, and Mill Creek, the reservoir is ideal for boating, water skiing, wet biking, and swimming. These facilities make it easy for visitors to enjoy a variety of water sports​.
Camping and Picnicking: The area boasts several campgrounds, including Buttermilk, McCrea Bridge, Mill Creek, and the West End. These campgrounds have tent and trailer sites, restrooms, and picnic areas with tables and grills, providing a comfortable and enjoyable camping experience​​.
Hiking and Wildlife Viewing: The surrounding forests and the reservoir’s shoreline offer excellent hiking and wildlife viewing trails, allowing visitors to immerse themselves in the region’s natural beauty.
The management of Island Park Reservoir includes efforts to maintain the ecological balance and health of the area. Thanks to regular stocking and careful management practices aimed at preserving the natural habitat and ensuring sustainable fishing opportunities​, the reservoir supports a variety of fish species.
Island Park Reservoir stands out as a premier destination in Idaho. It provides a pleasant mix of outdoor leisure, scenic beauty, and well-kept infrastructure. Whether fishing, boating, hiking or simply enjoying a picnic, Island Park Reservoir provides a memorable outdoor experience for visitors of all ages​.