Keller Dam 3686, located in Harlan, Nebraska, was completed in 1976 with the primary purpose of flood risk reduction along Mill Creek. This earth dam stands at a height of 11.9 feet with a hydraulic height of 8.9 feet, providing a storage capacity of 91.9 acre-feet. Despite its low hazard potential, the dam's condition assessment is rated as poor, indicating a need for maintenance and repair to ensure its continued effectiveness in mitigating flood risks.

Managed by a private owner, Keller Dam 3686 is regulated by the Nebraska Department of Natural Resources, with state jurisdiction, permitting, inspection, and enforcement in place to uphold safety standards. The dam's location in Congressional District 03, Nebraska, places it under the representation of Adrian Smith (R) in matters concerning federal oversight. With a drainage area of 0.69 square miles and a maximum discharge capacity of 251 cubic feet per second, this dam plays a crucial role in safeguarding the surrounding area from potential flooding events.

Despite its age, Keller Dam 3686 remains a key asset in the flood risk reduction infrastructure of Nebraska. As climate change brings about more frequent and intense precipitation events, the maintenance and upkeep of dams like Keller Dam 3686 are essential in protecting communities and ecosystems from the impacts of extreme weather. Continued monitoring and investment in infrastructure resilience will be vital in ensuring the long-term effectiveness of this critical water resource management structure.