Located in Mills County, Iowa, the Waubonsie Creek Watershed Site 3-8 is a vital water resource managed by the local government for purposes such as fire protection, stock, and small fish pond maintenance. This Earth dam, completed in 1989, stands at 69 feet high and spans 650 feet in length, with a storage capacity of 606 acre-feet. The dam also serves flood risk reduction for the surrounding area, making it a crucial asset for water management in the region.

Managed by the USDA NRCS, this watershed site on McPherson Creek is regulated by the Iowa Department of Natural Resources (DNR) and undergoes regular inspections and enforcement to ensure its structural integrity. The dam has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in July 2020. With a drainage area of 0.64 square miles and a surface area of 18.2 acres, this site plays a crucial role in water storage and management in this part of Iowa.

The Waubonsie Creek Watershed Site 3-8, with its moderate risk assessment score, represents a significant piece of infrastructure for water resource and climate enthusiasts in the region. With its controlled spillway and regulated operations, this site serves as a model for effective water management and conservation practices. As climate change continues to impact water resources, the importance of such structures in mitigating flood risks and ensuring water availability for various purposes cannot be overstated.