Twp Road 18 is a vital flood risk reduction structure located in Tracy, Minnesota, along the Cottonwood River. Built in 2000 by MNDOT, this earth dam stands at 23 feet tall and spans 600 feet in length. Its primary purpose is flood risk reduction, with a normal storage capacity of 1 acre-foot and a maximum discharge rate of 556 cubic feet per second. Despite its low hazard potential and satisfactory condition assessment, the dam is under state regulation by the Minnesota Department of Natural Resources, Environmental and Water Resources Division.

The dam's design features a buttress core type and an uncontrolled spillway, with an unlisted/unknown foundation. It is inspected every 8 years, with the last assessment conducted in 2016. The structure has a moderate risk assessment rating of 3, indicating a need for ongoing risk management measures. While no Emergency Action Plan (EAP) or inundation maps have been prepared, the dam's emergency contacts and risk management procedures are up to date. With its critical role in protecting the surrounding area from flooding, Twp Road 18 remains a key asset in water resource management for Lyon County.

Water resource and climate enthusiasts will appreciate the detailed information available for Twp Road 18, showcasing its importance in flood risk reduction efforts in Minnesota. The dam's location, design specifications, and regulatory oversight provide insight into the complexities of managing water infrastructure in environmentally sensitive areas. As climate change continues to impact precipitation patterns and water levels, structures like Twp Road 18 play a crucial role in safeguarding communities and ecosystems from the threat of flooding. By understanding the nuances of this dam's construction, maintenance, and risk assessment, enthusiasts can gain a deeper appreciation for the intersection of water resources and climate resilience in the region.