Hill River Lake in Polk, Minnesota, is a state-regulated gravity dam built in 1950 by MNDNR with a primary purpose of flood risk reduction along the Hill River. The dam stands at 6 feet tall, with a hydraulic height of 4.9 feet and a structural height of 8 feet, providing a storage capacity of 940 acre-feet and a surface area of 88 acres. It has a low hazard potential and is deemed to be in satisfactory condition as of the last inspection in 2015.

Located in Brooks, Minnesota, Hill River Lake plays a crucial role in managing water resources and mitigating flood risks in the region. With a drainage area of 99 square miles and a maximum discharge capacity of 760 cfs, the dam helps regulate water flow and protect nearby communities from potential floods. Despite its age, the dam continues to operate effectively, with state agencies overseeing its permitting, inspection, and enforcement processes to ensure public safety and environmental compliance.

Managed by the Minnesota Department of Natural Resources, Hill River Lake serves as a vital infrastructure for flood risk reduction in the area, with a moderate risk assessment rating. The dam's design and construction by MNDNR demonstrate a commitment to water resource management and climate resilience. As climate change impacts become more pronounced, structures like Hill River Lake play a crucial role in safeguarding communities and ecosystems from the growing threat of extreme weather events.