Merlin Mader Dam 1, located in Sioux County, Nebraska, is a privately owned structure designed by the USDA NRCS for flood risk reduction along the TR-Indian Creek. Completed in 1961, this Earth-type dam stands at 21 feet in height and spans a length of 595 feet, with a storage capacity of 151 acre-feet. Despite its low hazard potential, the dam is regulated and inspected by the Nebraska Department of Natural Resources to ensure its structural integrity and safety measures are up to standard.

The dam's primary purpose is flood risk reduction, serving as a vital infrastructure piece in the region's water resource management. With a normal storage capacity of 115 acre-feet and a maximum discharge of 286 cubic feet per second, Merlin Mader Dam 1 plays a crucial role in protecting the surrounding area from potential flooding events. Although its condition assessment is currently not rated, regular inspections are conducted to monitor the dam's performance and address any maintenance needs to uphold its functionality.

The dam's location in Ardmore, South Dakota, within the Omaha District, highlights its significance in mitigating flood risks for the local community. With its stone core and soil foundation, Merlin Mader Dam 1 showcases the collaborative efforts between private ownership and government agencies in safeguarding water resources and enhancing climate resilience in the region.