Mill Creek 13a, also known as Luttig, is a vital flood risk reduction structure located in Richland, Wisconsin. Managed by the local government and designed by the USDA NRCS, this earth dam stands at a height of 24 feet and spans 640 feet in length. Completed in 1962, it serves multiple purposes including debris control, flood risk reduction, and recreation, with a storage capacity of 175 acre-feet and a drainage area of 1 square mile.

Despite its age, Mill Creek 13a is assessed to be in fair condition with a low hazard potential. The dam's spillway is uncontrolled, allowing for a maximum discharge of 159 cubic feet per second. The structure is inspected every 10 years, with the last assessment conducted in April 2016. While it meets regulatory standards set by the Wisconsin Department of Natural Resources, there are no immediate plans for modification or improvement.

With its strategic location on the East Branch Mill Creek, Mill Creek 13a plays a crucial role in mitigating flood risks and ensuring the safety of nearby communities. As a key component of the local water management infrastructure, this dam continues to serve its purpose effectively while offering recreational opportunities for residents and visitors alike.