McDonald Flats Campground provides access to Green Mountain Reservoir with 12 campsites available for overnight use ($23/night) along the Heeney Road near the reservoir inlet.

The site offers boating (motorized and non-motorized), fishing, and picnicking opportunities, though potable water is not available and all motorboats require mandatory Aquatic Nuisance Species boat inspections at Heeney Marina before launch.