US Forest Service · Idaho
Buttermilk in Idaho. Ringed marker is this site; the other dots are the 722 public campsites we map in Idaho.
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.
Motocamp routes the vehicle you are actually in and picks up the road surface on the way. Download the state and it keeps working with no signal.
Start a 14-day trialSource: Recreation.gov, dated 2026-02-25, fetched 2026-09-07. Official listing.