Located in Woodbine, Iowa, the Mill Picayune Watershed Site P-90-1 is a dam managed by the local government with oversight from the Iowa Department of Natural Resources. Built in 1984 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock watering, and flood risk reduction for the area. With a height of 53 feet and a length of 600 feet, the dam has a storage capacity of 208 acre-feet and covers a surface area of 9 acres.

The dam is situated on the TR- Picayune Creek in Shelby County, Iowa, within the Rock Island District. With a low hazard potential and a moderate risk assessment rating, the Mill Picayune Watershed Site P-90-1 is not currently rated for its condition but is regularly inspected and maintained by the local authorities. While its primary purpose is for fire protection and water storage, the dam also contributes to flood risk reduction in the area, showcasing its importance in managing water resources and protecting the community from potential hazards.

As a key infrastructure for water management in the region, the Mill Picayune Watershed Site P-90-1 plays a vital role in ensuring water availability for various uses while minimizing flood risks. With its earth dam structure and regulated state jurisdiction, the site stands as a testament to the collaborative efforts between local government and regulatory agencies to safeguard water resources and enhance climate resilience in the face of changing environmental conditions.