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Potholes Reservoir




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General Information

Description - The Potholes Reservoir is part of the Columbia Basin Project and formed by O'Sullivan Dam. Potholes refers to the many glacial depressions in ancient sand dunes here. These potholes and small islands make this area one of the best in Washington for birding.

Attractions - Potholes Reservoir is open year-round. Developed campsites are available at Mardon Resort; (509)346-2651. Access to the reservoir is adequate except that the west side is limited. Fish species include yellow perch, crappie, largemouth bass, rainbow trout, and walleye.

Recreation - Fishing activities are available at Potholes Reservoir year-round and camping is available nearby. Hiking and hunting are also available. There are picnick sites and wildlife viewing is good.

Climate - The climate of Washington varies within each region. The Cascades split the state and alter the weather patterns. The mountains receive large amounts of wet, heavy snow from October through May. These peaks remain snow covered throughout the year. The terrain east of the mountains receives approximately 12 inches of rainfall per year, generally much less than west of the mountains. Since the area east of the mountains is landlocked, temperatures in this region are lower during the winter months. Frequent winds coming down from the mountains also contribute to the low temperatures of eastern Washington.

Due to the coastal geography, western Washington is primarily temperate. The proximity to the ocean stabilizes the climate, making extreme temperatures very rare. The area receives large amounts of precipitation from Pacific rain and snow storms.

Location - Potholes Reservoir is located 15 miles south of Moses Lake off State Rt. 262. A map is available above on this wildernet page.


Current Conditions & Trip Reports

Trip Reports:
Add your own trip Report! Newly re-released feature. One of the most popular features on Wildernet, trip reports allow you to share your experiences with others. This is an invaluable resource for determining what to expect on your outdoor adventure, so please participate! To prevent spamming, you must be a registered user of Wildernet in order to submit a trip report

Filed By: matt (Samammish, WA)
Number of People Encountered: 11-25 ppl
Recommend to a Friend: Highly
Report: The wallaye biteing they were all over 20in. and its great weather.


More Information

Contact Information:
Potholes Reservoir, Washington Department of Wildlife, 1540 Alder St. N.W. , Ephrata, WA, 98823, Phone: 509-754-4624

Additional Information:
Columbia River Plateau - Throughout the Columbia River Plateau region, you can be as active or sedate as you want at any given moment. If you think of Washington only in terms of the damp forests and cityscapes of Puget Sound, you will be amazed at the sculpted beauty of this high desert land.
Washington Lakes and Reservoirs - Washington has an abundance of lakes and reservoirs managed both by USDI Fish and Wildlife and USDA National Forest Service.

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