The Davis Subwatershed M-7920 is a local government-owned earth dam located in Woodbury County, Iowa. Built in 1958 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 36 feet and a length of 350 feet, the dam has a storage capacity of 77 acre-feet and covers a surface area of 2.5 acres.

Managed by the Iowa DNR, the Davis Subwatershed M-7920 is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. Despite being rated as having a low hazard potential and a moderate risk assessment, the dam's condition is currently not rated. With a drainage area of 0.85 square miles and being situated on the Cottonwood Hollow river/stream, this dam plays a crucial role in water resource management in the region.

Overall, the Davis Subwatershed M-7920 is an important structure for local water resource management, providing essential services such as flood risk reduction and water storage. With its regulated status and state oversight, this dam ensures the safety and security of the surrounding community while contributing to the overall climate resilience of the area.