The Arnold-Armstrong Subwatershed Station 243+48, located in Monona, Iowa, is a vital water resource managed by the local government and the USDA NRCS. This earth dam structure was completed in 1962 for 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 95 acre-feet, the dam serves a drainage area of 5.36 square miles, primarily for Dutch Creek.

This low-hazard potential dam with uncontrolled spillway type has a moderate risk assessment rating of 3. Although the condition assessment is marked as "Not Rated," the dam's design and construction by the Natural Resources Conservation Service ensure its reliability and functionality. The structure's location in the Rock Island District further highlights its significance in managing water resources and mitigating potential risks in the region.

While the dam's inspection frequency, emergency action plan, and risk management measures are not specified in the data, its importance for fire protection, agricultural activities, and flood risk reduction in the area is evident. As climate change continues to impact water resources, the Arnold-Armstrong Subwatershed Station 243+48 plays a crucial role in sustainable water management and environmental conservation efforts in Monona, Iowa.