Potholes State Park

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.

Discover Pass: A Discover Pass is required for vehicle access to state parks for day use. For more information about the Discover Pass and exemptions, please visit the Discover Pass web page.
  1. Activities
  2. Boating
  3. Camping
  4. History
  5. Maps

Picnic & Day-Use Facilities
The park provides three picnic shelters with four tables each, plus 73 unsheltered picnic tables in a lawned, well-shaded area. All day-use facilities are first come, first served. Restrooms are available in the day-use area, located on the banks of the reservoir.

  • 3 miles of hiking trails
Water Activities & Features
  • 60-feet of dock
  • Boating
  • Four boat ramps
  • Freshwater fishing
  • Personal watercraft
  • Swimming
  • Water skiing
  • White-water kayaking
Other Activities & Features
  • Bird watching
  • Two volleyball fields
  • Horseshoe pit
  • Wildlife viewing
Additional Information
  • Volleyball players must bring their own equipment.
  • A recreational license is required for fishing and shellfish harvesting at Washington state parks. For regulations, fishing season information, or to purchase a recreational license, visit the Washington Department of Fish and Wildlife.