Located in Monona, Iowa, the Croy Subwatershed Site G3-2730 is a local government-owned dam designed by USDA NRCS, serving multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. Completed in 1951, this earth dam stands at a height of 30 feet and has a storage capacity of 17 acre-feet. Situated along the TR- Maple River, this site has a low hazard potential and a moderate risk assessment rating.

Managed by the Iowa DNR, the Croy Subwatershed Site G3-2730 is state-regulated with permitting, inspection, and enforcement mechanisms in place. The dam's primary function is to protect the surrounding area from potential flooding events while also providing water storage for various agricultural and recreational purposes. With a surface area of 1 acre and a drainage area of 0.18 square miles, this dam plays a crucial role in water resource management in the region.

While the condition of the dam is currently not rated, efforts are being made to ensure its structural integrity and safety. With its strategic location and multiple benefits for the community, the Croy Subwatershed Site G3-2730 serves as a valuable asset in the sustainable management of water resources and climate resilience in Monona, Iowa.