Mc Donald Subwatershed Site 5-2290, located in Mapleton, Iowa, is a vital water resource managed by the local government for multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. This earth-type dam, completed in 1959, stands at a height of 33 feet and spans 628 feet in length, with a storage capacity of 27 acre-feet. Situated on the TR-Little Sioux River, this structure plays a crucial role in regulating water flow and protecting the surrounding area from potential hazards.

Managed by the Iowa Department of Natural Resources, this site is subject to state regulation, permitting, inspection, and enforcement. Despite its low hazard potential and moderate risk assessment, the condition of the dam has not been rated. It is important to note that the last inspection took place in November 1963, indicating a need for updated assessments and risk management measures to ensure the continued safety and functionality of the structure. With its strategic location and significance in the region's water management system, Mc Donald Subwatershed Site 5-2290 serves as a critical asset for both the local community and the environment.