Phillips Subwatershed Site M-11985 in Monona, Iowa is a state-regulated dam with a primary purpose of fire protection, stock, or small fish pond. Completed in 1956 by USDA NRCS, this earth dam has a height of 21 feet and a storage capacity of 83 acre-feet. Situated along the TR-Maple River, this dam serves multiple purposes including flood risk reduction, making it a valuable asset for water management in the area.

With a low hazard potential and a moderate risk assessment rating, Phillips Subwatershed Site M-11985 is a well-maintained structure that meets state regulatory requirements for inspection, enforcement, and permitting. While the dam's condition assessment is not rated, its emergency action plan status is unclear, indicating a potential area for improvement. Overall, this site plays a crucial role in water resource management for the community of Castana and surrounding areas, providing essential services for fire protection, stock, and small fish pond activities while also contributing to flood risk reduction efforts along the Maple River.

As a part of the National Resources Conservation Service, Phillips Subwatershed Site M-11985 exemplifies the importance of sustainable water infrastructure for climate resilience. With its strategic location in Monona, Iowa and its history of service since 1956, this dam stands as a testament to the ongoing efforts to manage water resources effectively while balancing multiple needs such as flood risk reduction and wildlife habitat preservation. For water resource and climate enthusiasts, this site serves as a valuable case study in responsible dam management and the intersection of environmental stewardship and community safety.