Prosser Ranch Group Campground is a tent-only group site accommodating up to 50 people on a hilltop overlooking Prosser Reservoir, featuring five picnic tables, three fire rings, and a large BBQ.

A boat ramp is located on-site, providing access for kayaking, swimming, and fishing, with power boating allowed under a 10-mph speed limit. Note that potable water is not available at this facility; campers must bring their own water.