McDonald Flats boat ramp provides access to Green Mountain Reservoir near Heeney, Colorado, with parking for vehicles up to 45 feet and a nearby campground offering 12 sites for overnight stays.

All motorboats must be launched from Heeney Marina with mandatory Aquatic Nuisance Species boat inspections. The area supports boating, fishing, water skiing, and swimming, with vault toilet facilities available at the adjacent campground.