Deep Fork River in central Oklahoma drains an area of 78,453 km² . The headwaters are in Britton, in northeastern Oklahoma City. The river flows through a long, narrow basin eastward for 370 km to its confluence with the North Canadian River in Lake Eufaula. The basin is elongated with an average width of 40.2 km. There are two reservoirs on the Deep Fork River, Lake Arcadia and Lake Eufaula. Lake Arcadia is at T04N R02W S36 in Oklahoma County, in the metropolitan areas of Oklahoma City and Edmond. Construction started in October 1980, and the reservoir became operational in November 1986. Other small lakes in the Deep Fork drainage include Belle Isle, Northeast, Aluma, Hiwassee, Clark, Okemah City, Stroud, Okmulgee, and Henryetta.