Roger Mills County, OK Area Lakes and Reservoirs Foss Lake Foss Reservoir is western Oklahoma's largest lake operated by the U.S. Bureau of Reclamation. The dam is 30 ft wide at the crest, 142 ft high and 18,130 ft long. The 8,800 acre lake with 63Foss Lake
Foss Reservoir is western Oklahoma's largest lake operated by the U.S. Bureau of Reclamation. The dam is 30 ft wide at the crest, 142 ft high and 18,130 ft long. The 8,800 acre lake with 63