Located in Lamoni, Iowa, the East Fork Big Cr Watershed Site E-4 is a crucial flood risk reduction structure designed by the USDA NRCS. Completed in 1990, this earth dam stands at a height of 16 feet and spans 500 feet, with a storage capacity of 75 acre-feet. The primary purpose of this dam is to mitigate flood risks in the area, benefiting not only the local community but also the surrounding environment.

With its location in Decatur County, Iowa, this site plays a vital role in protecting the TR- East Fork Big Creek and its watershed. Managed by the Iowa DNR, this structure is regulated, permitted, inspected, and enforced to ensure its functionality and safety. Despite its low hazard potential and moderate risk assessment, the East Fork Big Cr Watershed Site E-4 remains a cornerstone of water resource management in the region, demonstrating the importance of sustainable infrastructure in combating the effects of climate change.

As a part of the larger Rock Island District, this site exemplifies the collaborative effort between local government agencies and the USDA NRCS in safeguarding water resources. With a designated purpose of flood risk reduction and additional benefits for fire protection, stock maintenance, and small fish pond management, the East Fork Big Cr Watershed Site E-4 serves as a model for sustainable water infrastructure development in the face of changing climatic conditions.