Walling Subwatershed Sta 57+84 #1b is a local government-owned earth dam located in Woodbury County, Iowa, near the city of Oto. The dam was completed in 1953 and serves multiple purposes including fire protection, stock watering, small fish pond management, and flood risk reduction. With a height of 51 feet and a length of 400 feet, the dam has a storage capacity of 56 acre-feet and covers a surface area of 3.4 acres. The drainage area for the dam is 0.21 square miles, and it is regulated by the Iowa Department of Natural Resources.

Despite being classified as having a low hazard potential, Walling Subwatershed Sta 57+84 #1b is considered to have a moderate risk level of 3. The condition of the dam is currently not rated, and there is no information available on the last inspection date or frequency. The dam is equipped with an uncontrolled spillway and has not undergone any modifications in recent years. While the emergency action plan status and risk management measures for the dam are not specified, it is clear that the structure plays a crucial role in water resource management and protection in the area.

Overall, Walling Subwatershed Sta 57+84 #1b stands as a significant infrastructure for water conservation and flood control in the Little Sioux River watershed. As climate change continues to impact water resources, monitoring and maintaining the integrity of such structures will be essential for ensuring the safety and sustainability of the surrounding communities. With its historical significance and vital role in local water management, Walling Subwatershed Sta 57+84 #1b serves as a key focal point for water resource and climate enthusiasts seeking to understand the intersection of infrastructure, environmental conservation, and climate resilience.