Mud Lake, located in Renville, Minnesota, is a dam structure owned by the local government that serves multiple purposes, including flood control and water storage. Completed in 1986, this buttress-type dam stands at a height of 10 feet and has a storage capacity of 600 acre-feet. The dam spans 110 feet in length and is situated on the Little Rock Creek, contributing to the drainage area of 7 square miles.

While Mud Lake has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment, it is regulated by the Minnesota Department of Natural Resources, with state permitting, inspection, and enforcement mechanisms in place to ensure its safe operation. The dam's spillway is uncontrolled, with a hydraulic height of 3 feet and a structural height of 10 feet. The risk assessment for Mud Lake is classified as moderate, indicating a need for ongoing monitoring and risk management measures to safeguard against potential issues.

Overall, Mud Lake provides a valuable resource for water management in the region, contributing to flood protection and water storage capabilities. Its location in New Ulm and its association with the St. Paul District of the US Army Corps of Engineers underscore its importance in the local water infrastructure. With state oversight and regular inspections in place, Mud Lake continues to play a crucial role in maintaining water resources and climate resilience in the area.