Located in Harrison County, Iowa, the Mill Picayune Watershed Site S-10-7 is a crucial water resource managed by the local government with assistance from the USDA NRCS. This earth dam structure was completed in 1962 and serves multiple purposes including fire protection, stock watering, and small fish pond management. With a dam height of 45 feet and a storage capacity of 108 acre-feet, the site covers a surface area of 5.4 acres and drains a small area of 0.18 square miles.

The dam, situated on TR-Picayune Creek, is regulated by the Iowa DNR and is primarily used for flood risk reduction in the region. With a low hazard potential and a moderate risk rating, the structure is not currently rated for its condition assessment. Despite its age, the site continues to operate effectively, providing essential water management functions for the local community. While the dam has no associated locks or spillways, it remains a vital component of the watershed's infrastructure.

As an integral part of the water management system in Iowa, the Mill Picayune Watershed Site S-10-7 stands as a testament to the importance of sustainable water resource management. With its multiple purposes and regulated operations, the site plays a key role in protecting the local environment, ensuring water availability for various needs, and mitigating flood risks. As climate change continues to impact water resources, structures like this will become even more critical in maintaining the resilience of communities and ecosystems in the face of changing environmental conditions.