Bear Valley S-21b, located in Zumbro Falls, Minnesota, is a privately owned earth dam constructed in 1963 by the USDA NRCS for flood risk reduction along Cold Creek. Standing at a height of 26 feet and spanning 540 feet in length, the dam has a storage capacity of 132 acre-feet and a drainage area of 1.1 square miles. Despite being classified as having a low hazard potential, the dam is regularly inspected and maintained by the Minnesota Department of Natural Resources to ensure its structural integrity and satisfactory condition.

With a maximum discharge of 605 cubic feet per second, Bear Valley S-21b utilizes an uncontrolled spillway and outlet gates. The dam's primary purpose is flood risk reduction, serving the surrounding area by mitigating potential flooding events. While the dam is deemed to have a moderate risk level, it meets regulatory guidelines and is equipped with emergency action plans to address any unforeseen circumstances. The surrounding community benefits from the dam's presence as it helps safeguard against potential flood damage and provides essential water resource management for the region.

Overall, Bear Valley S-21b plays a crucial role in protecting the Wabasha County area from flood risks, ensuring the safety and security of residents in Zumbro Falls. As a key structure in the region's water resource infrastructure, the dam serves as a vital component in managing water flow and minimizing the impact of potential flooding events. With regular inspections and maintenance, Bear Valley S-21b continues to fulfill its purpose of flood risk reduction effectively and efficiently, contributing to the overall resilience of the local ecosystem and community.