The Upper Beaver Subwatershed Site 4-1, located in Monona, Iowa, is a key water resource managed by the local government for purposes such as fire protection, stock, and small fish pond maintenance. Built in 1968 by the USDA NRCS, this earth dam stands at a height of 49 feet and has a storage capacity of 81 acre-feet. With a drainage area of 0.26 square miles and a surface area of 4.4 acres, this dam plays a crucial role in flood risk reduction in the region, particularly along the TR-Beaver Creek.

Managed by the Iowa DNR, this dam has a low hazard potential and a moderate risk assessment rating. Although not currently rated for its condition, the dam is inspected, permitted, and regulated by state agencies to ensure its structural integrity and safety. With a primary purpose of providing essential services to the community and protecting the surrounding area from potential flooding, the Upper Beaver Subwatershed Site 4-1 serves as a vital infrastructure for sustainable water resource management in the region. Enthusiasts of water resources and climate resilience will find this site to be a fascinating example of engineering ingenuity and environmental stewardship in action.