Buttermilk Campground features a concrete boat ramp with docks located between the main campground and group camping area, providing convenient water access for Island Park Reservoir.

The ramp includes a large parking area for boat trailers and is situated within a 55-site campground offering vault toilets, drinking water, and RV sites with electric hookups.

Access is via paved roads to the campground entrance, though interior roads are gravel; the ramp operates seasonally from late May through early September.