West Fork Big Creek Watershed Site W-20, located in Ringgold County, Iowa, is a flood risk reduction structure designed by the USDA NRCS and completed in 2000. This earth dam stands at 22 feet high, with a length of 520 feet and a storage capacity of 56 acre-feet. Its primary purpose is flood risk reduction, serving the local community and ecosystem by protecting against potential water-related hazards.

Managed by the Iowa DNR, this site is state-regulated, permitted, inspected, and enforced to ensure its safety and effectiveness. Despite being rated as low hazard potential and not yet assessed for condition, it plays a crucial role in managing the watershed's water resources. With a moderate risk assessment score, there is a need for continued monitoring and risk management measures to maintain its functionality and safety for the surrounding area.

As part of the TR-Wolf Creek watershed, West Fork Big Creek Watershed Site W-20 contributes to the overall water management efforts in the region. With its location in a critical drainage area and its significance for flood risk reduction, this structure highlights the importance of sustainable water resource management practices in mitigating climate-related challenges and protecting communities from potential disasters.