Held Watershed Site A-3 is a strategically designed earth dam located in Sioux City, Iowa, along the TR-Floyd River. Built in 1965 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a dam height of 38 feet and a length of 440 feet, this structure stands as a testament to effective water resource management in the region.

The dam has a storage capacity of 60 acre-feet and a surface area of 4.3 acres, benefiting from a low hazard potential and a moderate risk assessment rating. Managed by the local government and regulated by the Iowa DNR, this site not only provides essential water storage but also contributes to environmental conservation efforts. With state permitting and inspection in place, the dam ensures the safety and sustainability of the surrounding community.

As a part of the broader watershed management strategy, Held Watershed Site A-3 plays a crucial role in maintaining a balanced ecosystem and safeguarding against potential water-related emergencies. With its well-maintained structure and adherence to regulatory standards, this site stands as a model for effective dam construction and management in the region, highlighting the importance of sustainable water resource practices in mitigating climate impacts.