Located in Harrison County, Iowa, the Mill Picayune Watershed Site S-1 is a local government-owned dam designed by USDA NRCS for multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. Completed in 1994, this earth dam stands at a height of 32 feet and spans a length of 630 feet, with a storage capacity of 215 acre-feet. Situated on TR- South Picayune Creek, this structure plays a crucial role in managing water resources in the region.

With a drainage area of 0.81 square miles, the Mill Picayune Watershed Site S-1 has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. Despite its moderate risk level, this dam does not have an Emergency Action Plan (EAP) in place and lacks certain risk management measures. As part of the state-regulated infrastructure, the site is subject to inspection, permitting, and enforcement by the Iowa Department of Natural Resources (DNR), ensuring its compliance with safety standards and regulations.

For water resource and climate enthusiasts interested in the management of small-scale water structures, the Mill Picayune Watershed Site S-1 offers a compelling case study. From its multi-purpose design to its role in flood risk reduction, this dam exemplifies the importance of local government initiatives in safeguarding communities against water-related hazards. With a focus on sustainability and compliance with state regulations, this site serves as a valuable asset in the broader ecosystem of water resource management in Iowa.