Located in Monona County, Iowa, the Arnold-Armstrong Subwtrshd Sta 62+89 #1 is a dam designed by the USDA NRCS in 1962 for fire protection, stock, or small fish pond purposes. The dam, primarily serving the TR-Dutch Creek, stands at 20 feet tall and spans 534 feet in length with a storage capacity of 58 acre-feet. With a drainage area of 1.37 square miles and a surface area of 3.9 acres, this earth-type dam plays a crucial role in flood risk reduction in the region.

Managed by the Iowa DNR and with state-regulated operations, this dam has a low hazard potential and a moderate risk assessment rating. While the condition assessment is not rated, the dam has not been modified over the years. The emergency action plan status, including preparedness and risk management measures, remains undisclosed. Situated in a picturesque setting in Castana, this dam serves as a vital water resource and climate infrastructure in the area, reflecting the collaborative efforts of local government and federal agencies in ensuring water management and safety.