Island Lake Twp 4 in Lyon County, Minnesota, is a privately owned dam constructed in 2009 by B&M NRCS with a primary purpose of Flood Risk Reduction. The earth dam stands at a height of 41 feet and has a length of 360 feet, with a storage capacity of 320 acre-feet. Located in Vesta, the dam is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections to ensure its satisfactory condition and low hazard potential.

The dam on County Ditch 37-TR serves to protect the surrounding area from flooding, with a drainage area of 1.1 square miles and a surface area of 163 acres. Despite its moderate risk assessment, the dam is considered to meet safety guidelines and is equipped with an uncontrolled spillway. With a history of state permitting and enforcement, Island Lake Twp 4 plays a crucial role in managing water resources in the region and mitigating potential flood risks for the community.

Overall, Island Lake Twp 4 is a vital infrastructure for flood risk reduction in Lyon County, Minnesota. With its strategic location and design, the dam effectively manages water flow from County Ditch 37-TR, protecting the area from potential inundation. Regular inspections and state oversight ensure the dam's structural integrity and safety, making it a key component in the region's water resource management and climate resilience efforts.