Flat Rock Campground offers 17-36 campsites (depending on source) at 6,400 feet elevation near Island Park, Idaho, with direct access to the Henry's Fork of the Snake River for fly-fishing and floating.

The campground features electric hookups at select sites, vault toilets, potable water, and gravel roads suitable for RVs up to 65 feet, though highway noise from adjacent US-20 is notable.

A nearby float takeout and proximity to Big Springs National Recreation Water Trail (3-hour float) make it convenient for paddlers, while Macks Inn across the highway provides additional services including boat rentals and shuttle access.