CAMPANAC.
U.S. Forest Service · Island Park Reservoir · ID

Buttermilk

BUTTERMILKPhoto · U.S. Forest Service
Not publishedStatus
ReservableAccess
56Sites
50 ftMax rig

The place

Buttermilk Campground is located approximately 30 miles southwest of West Yellowstone, Montana and 32 miles north of Ashton, Idaho in beautiful Island Park, Idaho. Buttermilk sits next to Island Park Reservoir at an elevation of 6,200 feet. Visitors love Island Park for its world-class fishing and outstanding scenery and wildlife viewing opportunities. Recreation The Island Park area is prized for its fishing; the Henry's Fork is known as one of the nation's best fly-fishing streams. Anglers cast for rainbow, cutthroat and brook trout and Kokanee salmon. Keep reading

Island Park Reservoir offers boating, water skiing and excellent fishing opportunities. The reservoir is used for irrigation so the water level recedes throughout the summer, but is generally useable all season. Henry's Lake is nearby. Hiking, biking, horseback riding and ATVing are popular activities. Many miles of trails are in the area, including the Continental Divide National Scenic Trail and the Nez Perce Trail. The Big Springs National Recreation Water Trail offers an approximately three-hour float or canoe trip through beautiful scenery. Wildlife, including moose, bald eagles and Sandhill cranes, are often seen along the trail. Facilities The campground contains two loops for single family camping and one loop for group camping, with a total of 55 sites. The large group site can accommodate up to 150 people. Site 038 has 15-amp electric hookups. Vault toilets and drinking water are provided. A concrete boat ramp with docks is located between the group camping and single family camping loops. Access to the campground is on a paved road but the interior loop roads and parking spurs are gravel. Natural Features Island Park is composed of two areas of extinct volcanic activity. The Henry's Fork Caldera sits inside the larger Island Park Caldera. The area is known for its dense forests of lodgepole pine, broad grassy meadows bursting with summer wildflowers and a wide variety of wildlife, including black and grizzly bears, moose, elk, deer, bald eagles, Sandhill cranes and much, much more. The campground is situated in a forest of lodgepole pine, which provides partial shade in some sites. Some areas of the campground are more open and sunny than others. Nearby Attractions Mesa Falls Scenic Byway is 13 miles south of the campground. This 28-mile road leads to scenic overlooks and trails at 110 foot Upper Mesa Falls and 85 foot Lower Mesa Falls. Harriman State Park is 15 miles south. The Henry's Fork meanders through the Harriman, offering excellent fishing. Over 20 miles of trails are available, and wildlife is abundant in this scenic park. Henry's Lake State Park is 18 miles north, offering fishing, a fish cleaning station and boat ramp. Yellowstone National Park's west entrance is just 29 miles north in the town of West Yellowstone, Montana. Visitors enjoy day-tripping to the park for unparalleled wildlife viewing and the beautiful and unique scenery.

SRC · Recreation.gov RIDB full extract · 2026-08-23

The sites · 56

LoopSiteTypeMax rigElectricADA
B027standard nonelectric45 ft—
B028standard nonelectric50 ft—
B029standard nonelectric45 ft—
B030standard nonelectric45 ft—
B031standard nonelectric45 ft—
B032standard nonelectric45 ft—
B033standard nonelectric45 ft—
B034standard nonelectric45 ft—
B035standard nonelectric50 ft—
B036standard nonelectric45 ft—
B037standard nonelectric50 ft—
B038standard electric50 ft15
B039standard nonelectric45 ft—
B040standard nonelectric50 ft—
B041standard nonelectric45 ft—
B042standard nonelectric45 ft—
B043standard nonelectric45 ft—
B044standard nonelectric45 ft—
B045standard nonelectric45 ft—
B046standard nonelectric45 ft—
BUTTERMILKGS1group standard nonelectric50 ft—
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MANAGEMENT SITESXXXmanagement45 ft—
SRC · Recreation.gov RIDB full extract · 2026-08-23

Booking

183 daysBooking window before arrival

Recreation.gov default: most campsites can be booked six months prior to arrival date. Most campgrounds go on sale at 7am PT / 8am MT / 10am ET, but not always; check the facility Seasons and Fees tab. Some locations also offer shorter supplemental booking windows.

Book on recreation.gov
SRC · Rules verified against recreation.gov · 2026-08-24

Fees

Group Site Fees$65.00 per night Sunday through Thursday and $130.00 per night Friday and Saturday. A weekly rate is not available.
SRC · Recreation.gov RIDB full extract · 2026-08-23

Your representative

This campground sits in ID-02. This member’s public-lands record →

SRC · U.S. Census TIGER · MTJP Scorecard