Simpson Creek Watershed Site 4 in Fremont, Iowa, is a vital resource managed by the local government and designed by the USDA NRCS. This earth dam, completed in 1958, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 41 feet and a length of 604 feet, the dam has a storage capacity of 89 acre-feet and covers a surface area of 5 acres.

Located on the Simpson Creek, this watershed site is regulated by the Iowa DNR and falls under the jurisdiction of the state. The dam's hazard potential is rated as low, with a moderate risk assessment score of 3. Despite not being rated for condition assessment, the dam is regularly inspected, permitted, and maintained by state authorities to ensure its functionality and safety. With a drainage area of 0.31 square miles, the site plays a crucial role in managing water resources and mitigating potential flood risks in the surrounding area.

Overall, Simpson Creek Watershed Site 4 is a well-managed and essential infrastructure for water resource and climate enthusiasts to explore and appreciate. With its strategic location, multifunctional design, and regulatory oversight, the dam serves as a key asset in protecting the local community and environment from potential hazards and ensuring sustainable water management practices in the region.