The Horihan-Hazel Group is a private water resource infrastructure located in Whalan, Minnesota, along the Root River. Designed by the USDA NRCS and completed in 1978, this earth dam stands at a height of 29 feet and serves primarily for flood risk reduction. With a storage capacity of 26 acre-feet and a drainage area of 0.5 square miles, this structure plays a critical role in managing water flow in the region.

Managed by the Minnesota Department of Natural Resources, the Horihan-Hazel Group has a significant hazard potential but is currently in a satisfactory condition as of the last assessment in 2014. The dam is subject to regular inspections every four years to ensure its safety and effectiveness in flood control. With a moderate risk level of 3, the structure is closely monitored for any potential issues that may arise.

Located in Fillmore County, the Horihan-Hazel Group contributes to the overall water resource management in the area, providing essential flood protection for the surrounding community. As climate change continues to impact weather patterns and precipitation levels, structures like this play a crucial role in mitigating the risks associated with extreme weather events and preserving the water resources of the region.