The Ocmulgee River basin has three river subbasins designated by the U.S. Geological Survey: the Upper Ocmulgee River subbasin (hydrologic unit code 03070103); the Lower Ocmulgee River Subbasin (03070104); and the Little Ocmulgee River Subbasin (03070105).Ocmulgee River Basin Plan, Section 2: River Basin Characteristics, Georgia Department of Natural Resources, Environmental Protection Division.
