Zellmer Subwtrshd Sta 31+70 #M is a local government-owned dam located in Woodbury County, Iowa, specifically in the city of ROLLY SPRINGS. Constructed in 1964 by the USDA NRCS, this earth dam has a height of 42 feet and a length of 407 feet, with a primary purpose of providing fire protection, stock, or small fish pond, as well as flood risk reduction. With a normal storage capacity of 19 acre-feet and a drainage area of 0.18 square miles, this dam serves as a valuable resource for the surrounding community.

Managed by the Iowa Department of Natural Resources, Zellmer Subwtrshd Sta 31+70 #M is regulated by state authorities for inspection, permitting, and enforcement. The dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment, with a moderate risk level identified. While it does not have a specific Emergency Action Plan (EAP) prepared, the dam has not undergone any recent modifications and has not required any major risk management measures to be implemented. Overall, this dam plays a crucial role in water resource management and protection in the area.

Located along the TR-WEST FORK LITTLE SIOUX RIV, Zellmer Subwtrshd Sta 31+70 #M provides important benefits for fire protection, stock water supply, and flood risk reduction in the region. With a focus on maintaining public safety and environmental sustainability, this dam stands as a key infrastructure for water resource and climate enthusiasts to monitor and support.