Located in Monona County, Iowa, the Croy Subwatershed Site M-10500 is a local government-owned dam designed by the USDA NRCS for various purposes including fire protection, stock, or small fish pond, and flood risk reduction. Completed in 1952, this earth dam stands at a height of 67 feet and has a storage capacity of 139 acre-feet, serving the TR- Maple River. With a drainage area of 0.51 square miles and a surface area of 5 acres, this structure plays a crucial role in managing water resources in the region.

Even though the dam has a low hazard potential and is currently rated as 'Not Rated' in terms of its condition assessment, it is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement. The dam's risk assessment is moderate, and there are no specific risk management measures or emergency action plan in place as of the latest data update in May 2021. Despite these challenges, the Croy Subwatershed Site M-10500 continues to be a vital component of the water infrastructure in the area, contributing to both water resource management and climate resilience efforts.

For water resource and climate enthusiasts, the Croy Subwatershed Site M-10500 offers a fascinating glimpse into the intricate network of dams and structures that play a critical role in safeguarding communities and ecosystems from the impacts of extreme weather events and flooding. As part of the larger Rock Island District, this dam stands as a testament to the collaborative efforts between federal, state, and local agencies in ensuring the sustainable management of water resources. Its location in the picturesque surroundings of Little Sioux adds to its significance, highlighting the intersection of nature, engineering, and environmental stewardship in the face of changing climate patterns.