Lake El Reno was created in 1966 in Canadian County, Oklahoma, near the city of El Reno, by constructing an earthen dam across Fourmile Creek,, a tributary of the North Canadian River. The lake has a normal capacity of 709 acre-feet, covers a surface area of 170 acres and is surrounded by 4 miles of shoreline. Its maximum depth is 19 feet. Th…Lake El Reno was created in 1966 in Canadian County, Oklahoma, near the city of El Reno, by constructing an earthen dam across Fourmile Creek,, a tributary of the North Canadian River. The lake has a normal capacity of 709 acre-feet, covers a surface area of 170 acres and is surrounded by 4 miles of shoreline. Its maximum depth is 19 feet. The lake is operated by the city of El Reno.