Eufaula Lake is a reservoir in Oklahoma. It is located on the Canadian River, 27mi upstream from its confluence with the Arkansas River and near the town of Eufaula. The lake covers parts of McIntosh County, Pittsburg, Haskell and Okmulgee counties and drains 47,522 mi2. Water sources include the Canadian, North Fork Canadian and Deep Fork rivers. It is the largest-capacity lake in the state of Oklahoma with a volume of 2099000 acre.ft, a surface area of 102000acre and 600mi of shoreline.HistoryCongress approved construction of the dam and lake in 1946 to provide flood control, hydroelectric power, water supply, navigation and recreation. The U. S. Army Corps of Engineers began construction of the 975 meter-long (3,199 feet) Eufaula Dam wall in 1956 and was completed in 1964. President Lyndon B. Johnson came to Oklahoma to dedicate the dam on September 25, 1964. The dam holds back a lake area of over. The hydroelectric power station was designed to provide 90,000 kilowatts of electric power from the lake waters.According to the Corps of Engineers in 2015, the Eufaula project cost $121.4 million, and has prevented nearly $575.5 million in flood damages since its completion.The lake attracts about 2.5 million visitors every year.