Mill Picayune Watershed Site D-3, located in Woodbine, Iowa, is a crucial dam structure built in 1968 by the USDA NRCS to serve multiple purposes such as fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 42 feet and a storage capacity of 114 acre-feet, this earth dam plays a pivotal role in managing water resources in the area. Situated on the TR-Boyer River, this dam covers a drainage area of 0.5 square miles and has a surface area of 5.8 acres, making it an essential feature for water resource and climate enthusiasts.

Owned by the local government and regulated by the Iowa DNR, Mill Picayune Watershed Site D-3 is deemed to have a low hazard potential with a moderate risk assessment rating. While the condition assessment is currently not rated, the dam has not been modified over the years since its completion. With a spillway type of uncontrolled, this dam is designed to handle any excess water flow effectively. The site also boasts a strategic location within the Rock Island District and falls under the jurisdiction of the state of Iowa, further highlighting its significance in the region.

As a structure that meets state permitting, inspection, and enforcement requirements, Mill Picayune Watershed Site D-3 sets a standard for responsible water resource management. With its primary purpose of ensuring safety and sustainability in the face of potential flooding and other water-related risks, this dam stands as a testament to the importance of proactive climate and water resource management practices. For enthusiasts and professionals alike, this site serves as a valuable case study in the intersection of infrastructure, environment, and community resilience.