Lake Elmo Regional Park, also known as Lake Elmo Dam, is a vital flood risk reduction structure located in Washington County, Minnesota. Constructed in 1981 by the USDA NRCS, this earth dam stands at a height of 26 feet and has a maximum storage capacity of 140 acre-feet. The dam serves to protect the surrounding area from potential flooding events, with a low hazard potential and a satisfactory condition assessment.

Managed by the local government, the dam is regulated, permitted, inspected, and enforced by the Minnesota Department of Natural Resources - Division of Ecological and Water Resources. The park's primary purpose is flood risk reduction, with a controlled spillway and uncontrolled outlet gates. The surrounding surface area is 281 acres, with a drainage area of 1.5 square miles, making it a critical infrastructure for water resource management in the region.

With a very high risk assessment rating of 1, Lake Elmo Regional Park plays a crucial role in mitigating flood risks and ensuring water resource sustainability in the area. The dam's design, construction, and maintenance are overseen by the Natural Resources Conservation Service, with regular inspections and a designated emergency action plan in place. Overall, Lake Elmo Regional Park serves as a valuable asset in safeguarding the community against potential water-related emergencies and maintaining the ecological balance of the region.