Eufaula, Reservoir at Canadian River near Eufaula, Oklahoma, United States

Eufaula Lake is a reservoir on the Canadian River near Eufaula in eastern Oklahoma, impounded by Eufaula Dam, a 3,200-foot-long, 114-foot-high structure of earthen embankment and concrete. The lake covers 102,000 acres with 600 miles of shoreline and holds 2,099,000 acre-feet, making it Oklahoma's largest-capacity lake. State Highway 71 runs across the top of the dam.

Construction of Eufaula Dam began in 1956 and ended in 1964 when the basin started filling gradually. President Lyndon Johnson dedicated the dam structure, which holds back water from several river channels and controls flood events downstream.

The lake is named after the nearby town of Eufaula; the sources do not mention any Eufaula Creek people. It is a well-known tournament lake where anglers from across the United States come to fish for largemouth bass, smallmouth bass, Kentucky bass, crappie, catfish, sandbass and stripers below the dam.

Boat ramps and marinas are spread around the water and offer access to different parts of the lake. Those arriving early in the day find less traffic and calmer conditions for fishing or boating.

Standing Rock, a landmark in the middle of the Canadian River about two miles below the junction of the North and South Canadians, is now under the lake. At the top level of 585 feet, its summit lies roughly 25 feet below the surface.