Upper Beaver Subwatershed Site M-1 is a local government-owned Earth dam located in Monona, Iowa, along the TR-Beaver Creek river. Built in 1967 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, or small fish pond maintenance, as well as flood risk reduction. With a height of 60 feet and a length of 402 feet, the dam has a storage capacity of 194 acre-feet and covers a surface area of 8.7 acres, draining an area of 0.41 square miles.

Despite its important functions, the dam's condition assessment in 2019 reported it to be in poor condition, with a moderate risk level assigned. The hazard potential is categorized as low, and the dam is currently not inspected on a regular basis. With the Iowa DNR as the state regulatory agency overseeing its operation, the dam's emergency action plan status, risk management measures, and inundation maps preparedness are all listed as unknown. As water resource and climate enthusiasts, it is crucial to monitor and address the maintenance and safety issues of Upper Beaver Subwatershed Site M-1 to ensure its effectiveness in protecting the local community and environment.