Cottonwood-Green Valley Subws 75+70 #2 is a water resource structure located in Monona, Iowa, with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction. Built in 1966 by the USDA NRCS, this earth dam stands at a height of 26 feet and stretches 518 feet in length, with a storage capacity of 50 acre-feet. Situated on the TR-Little Sioux River, this structure plays a crucial role in water management in the area.

Managed by the Iowa Department of Natural Resources, Cottonwood-Green Valley Subws 75+70 #2 is considered to have a low hazard potential and a moderate risk assessment rating. Despite not being rated for its condition, the dam continues to serve its purpose effectively. With a surface area of 2.8 acres and a drainage area of 0.88 square miles, this structure contributes to the overall water ecosystem in the region. Its uncontrolled spillway design ensures proper water discharge during times of high flow.

As a focal point for fire protection and flood risk reduction, Cottonwood-Green Valley Subws 75+70 #2 stands as a testament to sustainable water resource management. With its strategic location and effective design, this structure exemplifies the importance of responsible infrastructure development in mitigating climate-related challenges. As climate enthusiasts and water resource advocates, it is essential to recognize and appreciate the critical role that structures like this play in safeguarding our environment for future generations.