[1] It is the largest-capacity lake in the state of Oklahoma with a volume of 2,099,000 acre-feet (2.589×109 m3), a surface area of 102,000 acres (410 km2) and 600 miles (970 km) of shoreline.

[2] Congress approved construction of the dam and lake in 1946 to provide flood control, hydroelectric power, water supply, navigation and recreation.

[3] Heavy rains in the spring of 2015 caused Lake Eufaula to rise so rapidly that the Corps of Engineers opened the flood gates and released water at rates as high as 48,000 cubic feet (1,400 m3) per second.

[7] Activities at Lake Eufaula include boating, fishing, swimming, hiking, hunting, golfing and horseback riding.

Facilities include marinas, boat ramps, swim beaches, tent and RV campsites, cabins, group shelters, restrooms, showers and an enclosed fishing dock.

Oklahoma created two state parks, Arrowhead and Fountainhead, to provide recreational activities and camping facilities at the lake.

[11] However, a 48-acre tract of the land was placed into federal trust status in 2018, opening the way for development of the property as a tourist destination with gaming, restaurants and entertainment.