Little River Watershed Site M-1 is a crucial flood risk reduction structure located in Decatur, Iowa, along the Little River. Built in 1984, this earth dam stands at a height of 61 feet and spans 1810 feet, providing a storage capacity of 32,650 acre-feet. The dam serves multiple purposes beyond flood control, including recreation and water supply, making it a valuable asset for the local community.

Managed by the Iowa Department of Natural Resources, Little River Watershed Site M-1 has a high hazard potential and undergoes regular inspections to ensure its structural integrity. Despite its age, the dam is assessed to be in satisfactory condition, with a moderate risk rating. The surrounding area covers a drainage area of 20.85 square miles, with a normal storage capacity of 10,869 acre-feet and a surface area of 787 acres.

With its strategic location and significant role in mitigating flood risks, the Little River Watershed Site M-1 stands as a testament to effective water resource management in the region. Climate enthusiasts and water resource professionals alike can appreciate the engineering feat and ecological impact of this vital infrastructure in sustaining the local ecosystem and community resilience in the face of changing environmental challenges.