Woods Hollow Subwatershed Site 1-2875 is a dam located in Monona, Iowa, designed by the USDA NRCS and completed in 1960. This earth dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a height of 26 feet and a storage capacity of 25 acre-feet, this structure plays a crucial role in water resource management in the area.

Situated on the TR- Little Sioux River, Woods Hollow Subwatershed Site 1-2875 is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement. Despite its low hazard potential and moderate risk assessment, the condition of the dam has not been rated, and its emergency action plan status is unknown. The dam's spillway type is listed as uncontrolled, with a surface area of 2 acres and a drainage area of 0.35 square miles.

While the dam's primary purpose is to provide essential services to the local community, such as fire protection and stock pond management, it also contributes to flood risk reduction in the area. As a key component of the water resource infrastructure in Monona, Woods Hollow Subwatershed Site 1-2875 serves as a critical asset for climate and water resource enthusiasts interested in understanding and managing the region's water resources effectively.