East Fork Big Creek Watershed Site Z-5-2, located in Decatur, Iowa, is a flood risk reduction structure designed by the USDA NRCS and completed in 2003. This Earth dam stands at a height of 23 feet and has a length of 471 feet, providing a storage capacity of 55 acre-feet. The dam serves the primary purpose of flood risk reduction and is regulated by the Iowa DNR.

With a low hazard potential and a moderate risk assessment rating, the East Fork Big Creek Watershed Site Z-5-2 is an important asset for managing water resources in the region. The dam's uncontrolled spillway and soil foundation contribute to its functionality in handling excess water flow. Although the condition assessment is currently not rated, the structure is inspected, permitted, and regulated by state authorities to ensure its proper operation and maintenance.

Overall, the East Fork Big Creek Watershed Site Z-5-2 plays a crucial role in protecting the surrounding area from potential flooding events. With its location in a critical watershed and its strategic design for flood risk reduction, this structure serves as a valuable resource for water management and climate resilience efforts in Iowa.