Dundee Marsh, also known as Section 31 Impoundment, is a state-owned water resource located in Cottonwood County, Minnesota. Designed by Ducks Unlimited, this marsh serves as a vital habitat for wildlife and plays a crucial role in water management in the area. With a dam height of 7 feet and a capacity of 400 acre-feet, Dundee Marsh was completed in 2011 and covers an area of 873 acres.

Situated along the Des Moines River, Dundee Marsh is regulated by the Minnesota Department of Natural Resources and is inspected regularly to ensure its structural integrity. The dam has a low hazard potential and is deemed to be in satisfactory condition as of 2012. With a storage capacity of 400 acre-feet and a drainage area of 5.9 square miles, this water resource contributes to flood control, wildlife conservation, and recreational opportunities in the region.

Overall, Dundee Marsh stands as a testament to effective water resource management in Minnesota. Its importance extends beyond flood control to include habitat preservation, water quality improvement, and recreational benefits for the community. As climate change continues to impact water resources, Dundee Marsh serves as a model for sustainable and resilient infrastructure that adapts to changing environmental conditions.