Located in Monona, Iowa, the Croy Subwatershed Site A4-4572 is a small earth dam completed in 1951 for fire protection, stock, or small fish pond purposes. Managed by the local government, this site is regulated by the Iowa Department of Natural Resources and is designed by the USDA NRCS. With a low hazard potential and a moderate risk assessment rating, this dam has a storage capacity of 62 acre-feet and serves a drainage area of 0.52 square miles in the Maple River watershed.

The Croy Subwatershed Site A4-4572 plays a crucial role in flood risk reduction and water resource management in the region. Although the dam's condition is currently not rated, it is regularly inspected and maintained by state regulatory agencies to ensure its structural integrity and safety. With a spillway type of uncontrolled and a structural height of 20 feet, this dam serves as a vital infrastructure for the community of Little Sioux and surrounding areas.

Enthusiasts of water resources and climate will find the Croy Subwatershed Site A4-4572 a fascinating example of local government-led water management efforts. With its historic significance as a fire protection and stock pond structure, as well as its contribution to flood risk reduction in the Maple River watershed, this site showcases the importance of sustainable water infrastructure in rural Iowa. As the site continues to be monitored and managed by state agencies, it stands as a testament to the collaborative efforts towards resilient water resource management in the region.