Pony Creek Watershed Site 31, located in Mills County, Iowa, is a vital resource for fire protection, stock, and small fish pond purposes. Built in 1963 by the USDA NRCS, this earth dam stands at 38 feet high and spans 600 feet in length, with a storage capacity of 370 acre-feet. The dam serves to mitigate flood risks and covers a drainage area of 0.46 square miles along the TR-Pony Creek.

Managed by the local government and regulated by the Iowa DNR, Pony Creek Watershed Site 31 has a low hazard potential and a moderate risk assessment rating. The dam's spillway, an uncontrolled type, features a width of 2 feet. With a surface area of 13.9 acres and a normal storage capacity of 136 acre-feet, this site plays a crucial role in water resource management and climate resilience efforts in the region.

Despite not being rated for its condition assessment, Pony Creek Watershed Site 31 continues to undergo regular inspections to ensure its structural integrity. With the potential to impact downstream communities, this dam remains an essential infrastructure for both local residents and wildlife, highlighting the importance of sustainable water management practices in the face of a changing climate.