All waters · Washington · Potholes Reservoir
Potholes Reservoir, WA
Reservoir in Grant County, Washington. A roughly 28,000-acre irrigation reservoir in the Columbia Basin behind O'Sullivan Dam, famous for its sand-dune islands and flooded timber. A top warmwater destination for largemouth bass, walleye, black crappie, bluegill, and yellow perch. Walleye and bass fish well spring through fall; crappie and perch are reliable around the dunes and Lind Coulee.
Overall bite score
Scored 13 min ago · recomputed every 30 minutes
Each instrument reads 0 to 100. The score is their weighted blend, tuned for lakes and reservoirs. No black box: every reading names its source.
What swims here
8 tracked species in Potholes Reservoir, with the months each fishes best.
Water facts
Public ramps at Potholes State Park (MarDon) and the south end below O'Sullivan Dam. The live USGS gauge (Crab Creek near Beverly) is a downstream watershed proxy for the Potholes outflow, not a reading on the reservoir itself.
See the full forecast for Potholes Reservoir in the app: best windows, 7-day outlook, what to bring, and offline regulations. The score and essentials are free.
Not legal advice. Always verify with official state regulations.