Zellmer Subwtrshd Sta 60+50 #A is a local government-owned structure located in Woodbury, Iowa, specifically in Rolly Springs. Built in 1964 by USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 24 feet and a length of 399 feet, it has a storage capacity of 50 acre-feet and covers a surface area of 2.5 acres.

Managed by the Iowa Department of Natural Resources, this dam on the TR-West Fork Little Sioux River is equipped with an uncontrolled spillway. Despite its low hazard potential, it has a moderate risk assessment rating. The structure is inspected regularly by state authorities, ensuring its safety and functionality. With its strategic location and design, Zellmer Subwtrshd Sta 60+50 #A plays a crucial role in water resource management in the area and contributes to the overall resilience of the local ecosystem in the face of changing climate conditions.