Located in Decatur County, Iowa, the East Fork Big Cr Watershed Site Z-5-1 is a local government-owned dam designed by the USDA NRCS for fire protection, stock, or a small fish pond. Completed in 1995, this earth dam stands at 27 feet tall and spans 520 feet in length, providing a storage capacity of 110 acre-feet and covering a surface area of 5.6 acres. The dam serves multiple purposes, including flood risk reduction, and is regulated by the Iowa DNR with state permitting, inspection, and enforcement in place.

With a low hazard potential and a moderate risk assessment rating, this dam on TR-Zadie Creek is crucial for water resource management in the region. Although not currently rated for condition assessment, the East Fork Big Cr Watershed Site Z-5-1 plays a significant role in mitigating flood risks and providing water storage for various needs. As a part of the Rock Island District, this dam stands as a testament to collaborative efforts between federal and state agencies to ensure the safety and sustainability of water resources in the area.