Arnold-Armstrong Subwtrshd Sta 2+05 #3 is a dam located in Monona County, Iowa, owned and regulated by the local government. Built in 1962 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a dam height of 45 feet and a storage capacity of 107 acre-feet, the structure covers a surface area of 5.3 acres and drains an area of 0.8 square miles.

The dam is classified as having a low hazard potential and a moderate risk level, with a spillway type marked as uncontrolled. Despite not being currently rated for condition assessment, the dam is under state regulation and inspection by the Iowa DNR. Located offstream, Arnold-Armstrong Subwtrshd Sta 2+05 #3 plays a crucial role in water resource management in the region, providing essential services and protection to the surrounding community in Castana.

Overall, Arnold-Armstrong Subwtrshd Sta 2+05 #3 stands as a vital infrastructure for water resource and climate enthusiasts, showcasing the importance of sustainable water management practices in mitigating flood risks and supporting local agricultural activities. With its historical significance and functional design, this dam serves as a key component in maintaining the environmental and economic stability of Monona County, Iowa.