Wilderness Landscape & Natural Heritage
Potholes Reservoir is an expansive reservoir located in Grant County, Washington, formed by the impoundment of the Columbia Basin Irrigation Project. Covering over 8,600 surface acres, it stretches across the arid landscapes of the Columbia Plateau, offering a blend of aquatic and desert ecosystems. Created in the mid-20th century primarily for irrigation and flood control, the reservoir has evolved into a significant outdoor recreation destination. Its mosaic of potholes—small depressions filled with water—supports a rich habitat for migratory birds and a variety of fish species including walleye, bass, crappie, and yellow perch. The reservoir provides year-round opportunities for fishing, boating, waterfowl hunting, and wildlife viewing. Adjacent to the reservoir, the Potholes State Park offers camping, picnicking, and trails that give visitors access to open grasslands and rocky outcrops. Key landmarks include the outlying islands and shorelines that attract diverse bird populations such as Canada geese, ducks, and sandhill cranes. The region’s dry climate and flat topography also enable kite flying, windsurfing, and other wind-driven sports. Anglers and birdwatchers particularly prize Potholes Reservoir for its unique ecosystem and recreational diversity. Visitors appreciate the balance of active water sports and more tranquil nature observation activities at Potholes. Facilities are well maintained with boat launches, campgrounds, and picnic areas making it a favored getaway for outdoor enthusiasts from the Pacific Northwest.
