La Moyne Detention, located in Olmsted County, Minnesota, is a privately owned flood risk reduction structure designed by the USDA NRCS and regulated by the Minnesota Department of Natural Resources. Completed in 1971, this earth dam stands at a height of 25 feet and a length of 400 feet along the Zumbro River. With a primary purpose of flood risk reduction, La Moyne Detention helps manage water flow and protect surrounding areas from potential flood damage.

The dam has a low hazard potential and is deemed to be in satisfactory condition, as of the last inspection in July 2017. Despite its moderate risk assessment, the structure meets regulatory guidelines and has a history of successful risk management. The dam's operations include uncontrolled spillways and outlets, with a maximum discharge capacity of 320 cubic feet per second. The structure provides critical flood protection for the city of Oronoco and its surrounding areas, contributing to water resource management efforts in the region.

In the event of an emergency, the dam has an established inspection frequency of 8 years and is equipped with emergency action protocols to ensure public safety. La Moyne Detention plays a vital role in mitigating flood risks along the Zumbro River and highlights the importance of proactive water resource management in a changing climate.