The Potholes Reservoir is part of the Columbia Basin Irrigation Project. It is formed by the

O'Sullivan Dam O'Sullivan Dam (National ID # WA00268), one of the largest earthfill dams in the United States (200 ft/61 m high; 19,000 ft/5,791 m long; completed 1949), is on Crab Creek in the U.S. state of Washington, about 45 km south of Eph ...

and located in central

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

, in the United States. The reservoir is fed by water from

Moses Lake Moses Lake is a lake and reservoir along the course of Crab Creek, in the U.S. state of Washington. Moses Lake is part of the Columbia River basin, as Crab Creek is a tributary of the Columbia River. Although originally a shallow natural lake ...

, part of the Crab Creek basin. The area features several lakes (typically 30-70 yards wide and 10–30 feet deep). These lakes, known as "potholes" were created through both natural and man made processes. The potholes were initially carved out during the Pleistocene by flood waters originating from

Glacial Lake Missoula Lake Missoula was a prehistoric proglacial lake in western Montana that existed periodically at the end of the last ice age between 15,000 and 13,000 years ago. The lake measured about and contained about of water, half the volume of Lake Mi ...

. Subsequent damming of the area by the

Columbia Basin Project The Columbia Basin Project (or CBP) in Central Washington (state), Washington, United States, is the irrigation network that the Grand Coulee Dam makes possible. It is the largest water reclamation project in the United States, supplying irrigat ...

raised the water table high enough to allow these topographical depressions to become lakes. The formation of the pothole lakes also allowed the creation of thousands of micro-islands as the lakes wrap around the dunes, forming islands. They are home to willow trees and cattails due to their boggy-like state.

Recreation

On the shore of the reservoir is

Potholes State Park Potholes State Park is a public recreation area on the southern shore of Potholes Reservoir, located south of Moses Lake and northwest of Othello in Grant County, Washington. The state park was created following the completion of the O'Sulliva ...

, a member of the

Washington State Park System The U.S. state of Washington has over 140 state parks that are managed by the Washington State Parks and Recreation Commission. These include 19 marine parks and 11 Historical Parks. The park system was established in 1913 by the creation of t ...

. It has of shoreline on the reservoir.

Fishing

There are many types of fish inside of the reservoir, including: *

Largemouth bass The largemouth bass (''Micropterus nigricans'') is a carnivorous, freshwater fish, freshwater, ray-finned fish in the Centrarchidae (sunfish) family, native to the eastern United States, eastern and central United States, southeastern Canada an ...

Smallmouth bass The smallmouth bass (''Micropterus dolomieu'') is a species of freshwater fish in the Centrarchidae, sunfish family (biology), family (Centrarchidae) of the order (biology), order Centrarchiformes. It is the type species of its genus ''Micropterus ...

Rainbow trout The rainbow trout (''Oncorhynchus mykiss'') is a species of trout native to cold-water tributary, tributaries of the Pacific Ocean in North America and Asia. The steelhead (sometimes called steelhead trout) is an Fish migration#Classification, ...

Walleye The walleye (''Sander vitreus'', Synonym (taxonomy), synonym ''Stizostedion vitreum''), also called the walleyed pike, yellow pike, yellow pikeperch or yellow pickerel, is a freshwater perciform fish native to most of Canada and to the Northern ...

Black crappie The black crappie (''Pomoxis nigromaculatus'') is a freshwater fish in the sunfish family ( Centrarchidae). It is endemic to North America, one of the two types of crappies. It is very similar to the white crappie (''P. annularis'') in size, s ...

Yellow perch The yellow perch (''Perca flavescens''), commonly referred to as perch, striped perch, American perch or preacher is a freshwater perciform fish native to much of North America. The yellow perch was described in 1814 by Samuel Latham Mitchill fr ...

Bluegill The bluegill (''Lepomis macrochirus''), sometimes referred to as "bream", "brim", "sunny", or, in Texas, "copper nose", is a species of North American freshwater fish, native to and commonly found in streams, rivers, lakes, ponds and wetlands ea ...

Lake whitefish The lake whitefish (''Coregonus clupeaformis'') is a species of freshwater whitefish from North America. Lake whitefish are found throughout much of Canada and parts of the northern United States, including all of the Great Lakes. The lake white ...

Carp The term carp (: carp) is a generic common name for numerous species of freshwater fish from the family (biology), family Cyprinidae, a very large clade of ray-finned fish mostly native to Eurasia. While carp are prized game fish, quarries and a ...

Steelhead Steelhead, or occasionally steelhead trout, is the Fish migration#Classification, anadromous form of the coastal rainbow trout or Columbia River redband trout (''O. m. gairdneri'', also called redband steelhead). Steelhead are native to cold-wa ...

References

External links

Potholes Reservoir Unit
Washington Department of Fish and Wildlife
Potholes Reservoir Resource Management Plan
U.S. Department of the Interior
Potholes Reservoir Fishing
Washington Department of Fish and Wildlife {{authority control Reservoirs in Washington (state) Lakes of Grant County, Washington Moses Lake, Washington