Custer Twp 13 is a private-owned dam located in Lyon County, Minnesota, specifically in the city of Lamberton. Built in 2005 by the engineering firm Bolton and Menk, this earth dam stands at a height of 26 feet and serves the primary purpose of flood risk reduction along the Coon Creek. With a storage capacity of 21.8 acre-feet and a drainage area of 2.5 square miles, Custer Twp 13 plays a crucial role in managing water flow and mitigating potential flooding in the region.

Maintained and regulated by the Minnesota Department of Natural Resources (MNDNR EWR), Custer Twp 13 has a low hazard potential and has not been rated for its condition assessment. Despite its importance in flood risk reduction, the dam has not undergone recent modifications and is subject to inspection every 8 years. While the dam does not have an Emergency Action Plan (EAP) in place, it meets state permitting and enforcement requirements, ensuring its operational integrity in safeguarding the surrounding community from potential water-related emergencies.

As part of the St. Paul District of the US Army Corps of Engineers, Custer Twp 13 contributes to the overall water resource management efforts in the region, highlighting the vital role that private-owned dams play in protecting against flood hazards and ensuring the sustainable use of water resources in Minnesota.