The Muskingum Watershed Conservancy District is a political subdivision of the State of Ohio organized in 1933 to develop and implement a plan for flood reduction and water conservation in the Muskingum River watershed, the state's largest wholly contained watershed, covering more than 8,000 square miles (21,000 km2). Since the original construction of fourteen reservoirs and dams in the 1930s (two more were built later), more than $7 billion worth of property damage has been saved from flooding.