Your visitor source to Potholes Reservoir boat rentals, jet skis, water sports, and boat tours at this lake which is part of the Columbia Basin Project. It is formed by the O'Sullivan Dam and located in central Washington State. The reservoir is fed by water from Moses Lake, part of the Crab Creek basin. Offering recreational activities at the lake which include; wakeboarding, flyboard, water skiing, tubing, wakesurfing, kneeboarding, camping, hiking, and fishing. The damming of the area by the Columbia Basin Project raised the water table high enough to allow these topographical depressions to become lakes. On the shore of the reservoir is Potholes State Park, a 640-acre member of the Washington State Park System.