Located in Monona County, Iowa, the Croy Subwatershed Site M-6159 is a crucial water management structure designed by the USDA NRCS for fire protection, stock, and small fish pond purposes, as well as flood risk reduction. Completed in 1952, this earth dam stands at a height of 24 feet and has a storage capacity of 61 acre-feet, serving a drainage area of 1.04 square miles along the TR-Maple River.

With a low hazard potential and a moderate risk assessment score of 3, the Croy Subwatershed Site M-6159 is regulated by the Iowa DNR and subject to state permitting, inspection, and enforcement. Although its condition has not been rated, the dam continues to fulfill its intended functions, safeguarding the surrounding area from potential water-related hazards. As a part of the local government's infrastructure, this site plays a vital role in water resource management in the region, showcasing the importance of sustainable water practices in addressing climate challenges.