- Located 17 miles southwest of Moses Lake, WA
- State Parks
Potholes State Park is a 640-acre camping park with 6,000 feet of freshwater shoreline on Potholes Reservoir (also known as O'Sullivan Reservoir). Potholes Reservoir is often confused with the Pothole Lakes themselves, which are a 30- to 45-minute drive from the park. The terrain is desert with freshwater marshes.A vehicle parking permit is no longer required for day visits.
Hours + Fees
Summer: 6:30 a.m. to dusk.Winter: 8 a.m. to dusk.
Map + Directions
Located 17 miles southwest of Moses Lake, Wash., just east of the Cascades.From I-90:Take exit 179 at Moses Lake and follow signs to park.
From the south:Take Hwy. 17 and turn west on Hwy. 262 (O'Sullivan Dam Rd.). Or take Hwy. 26 and turn east onto Hwy. 262 (O'Sullivan Dam Rd.). Each direction is well signed.