Cranston Brothers Dam, located in Ida Grove, Iowa, was completed in 1977 by the USDA NRCS and is privately owned. This earth dam stands at a height of 32 feet and spans 350 feet, serving primarily for fire protection, stock, or small fish pond purposes. With a storage capacity of 62 acre-feet and a surface area of 4.5 acres, the dam is regulated by the Iowa Department of Natural Resources (DNR) and has a low hazard potential according to a risk assessment.

The dam, situated on the TR-MAPLE river or stream, is inspected by the state and meets regulatory standards for operation and enforcement. While the condition of the dam has not been rated, it poses a moderate risk (level 3) according to the assessment. With a drainage area of 0.25 square miles, the dam's primary purpose is to provide essential services while ensuring public safety and environmental protection. Despite being uncontrolled, the spillway type of the dam ensures the controlled release of excess water to prevent flooding during heavy rainfall events.

Overall, Cranston Brothers Dam plays a crucial role in water resource management in the region, demonstrating a commitment to sustainable infrastructure development and hazard mitigation. As a key feature of the local landscape, the dam serves multiple purposes and remains an essential asset for the community, showcasing the importance of effective dam regulation and maintenance in safeguarding water resources and adapting to climate challenges.