West Fork One Subwatershed Site 1-5000, located in Woodbury County, Iowa, was completed in 1955 by the USDA NRCS for the primary purposes of fire protection, stock, and small fish pond, as well as flood risk reduction. This earth dam stands at a height of 30 feet and has a length of 350 feet, providing a storage capacity of 62 acre-feet. With a low hazard potential and a moderate risk assessment rating, this dam on the TR-WEST FORK LITTLE SIOUX RIV stream is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement.

Despite its age, the condition of West Fork One Subwatershed Site 1-5000 is currently not rated, indicating that further assessment may be needed to ensure its continued safety and functionality. The dam's uncontrolled spillway and soil foundation contribute to its design as a crucial infrastructure for water resource management in the region. With its location in ROLLY SPRINGS, Iowa, this dam plays a vital role in maintaining water supply for fire protection and livestock, while also serving as a small fish habitat and reducing flood risks for the surrounding area. As a part of the Omaha District, this dam exemplifies the collaboration between local government and federal agencies in safeguarding water resources and mitigating climate-related risks.