Located in Ottumwa, Iowa, Jefferson Park Watershed Site 3 is a local government-owned flood risk reduction structure managed by the Iowa Department of Natural Resources. Built in 1976 by the USDA NRCS, this earth dam stands at a height of 42 feet and has a length of 720 feet, providing a storage capacity of 576 acre-feet. The dam is situated on the TR-Des Moines River and is designed to regulate water flow and mitigate flooding in the area.

With a surface area of 9.9 acres and a drainage area of 0.71 square miles, Jefferson Park Watershed Site 3 plays a crucial role in protecting the surrounding community from high hazard potential associated with flooding. The dam's satisfactory condition assessment and moderate risk rating indicate its reliability in flood risk reduction. The structure is regularly inspected by the Iowa DNR, with the last inspection conducted in June 2019, ensuring its effectiveness in safeguarding the area from potential disasters.

As a key component in the flood risk reduction strategy for Ottumwa, Jefferson Park Watershed Site 3 serves as a vital infrastructure in managing water resources and climate-related challenges in the region. Its presence highlights the importance of proactive measures in enhancing resilience to natural disasters and underscores the collaborative efforts between local government agencies and federal entities like the USDA NRCS in safeguarding communities against potential flood threats.