Horihan-Herrick, located in Whalan, Minnesota, is a privately owned dam designed by the USDA NRCS for flood risk reduction along the Root River. Completed in 1991, this earth dam stands at 36 feet tall with a length of 350 feet, providing a storage capacity of 34 acre-feet. Despite its low hazard potential and satisfactory condition assessment, the dam is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections and enforcement to ensure its safety and effectiveness.

With a drainage area of 0.5 square miles and a maximum discharge of 300 cubic feet per second, Horihan-Herrick plays a crucial role in managing water flow and mitigating flood risks in the region. The dam's spillway, although uncontrolled, helps to maintain water levels within safe limits. While the dam's primary purpose is flood risk reduction, it also serves as a valuable resource for water resource and climate enthusiasts, showcasing the intersection of infrastructure, environmental stewardship, and community resilience in managing water resources.

As part of the St. Paul District of the USACE, Horihan-Herrick stands as a testament to the collaborative efforts between federal agencies, private owners, and state regulators in safeguarding communities against potential flood hazards. With its moderate risk assessment and regular monitoring, this dam exemplifies the importance of proactive risk management and the critical role of infrastructure in adapting to changing climate conditions and ensuring water security for all.