Andrew Dam, located in Decatur County, Iowa, is a private earth dam constructed in 1983 by the USDA NRCS for fire protection, stock, and small fish pond purposes. The dam stands at a height of 30 feet with a length of 233 feet, providing a storage capacity of 25 acre-feet and covering a surface area of 2.3 acres. Despite being classified as having low hazard potential, the dam is regulated, permitted, inspected, and enforced by the Iowa Department of Natural Resources, ensuring its safety and compliance with state regulations.

Situated on the TR- MC GRUDER CR. stream, Andrew Dam is designed to control water flow and prevent flooding in the surrounding area. With a moderate risk assessment score of 3, the dam's condition is currently rated as "Not Rated," indicating the need for further evaluation. The dam's emergency action plan status, inundation maps, and risk management measures are currently not available, highlighting areas for improvement in emergency preparedness.

Owned privately and operated for multiple beneficial purposes, Andrew Dam serves as a vital infrastructure for water resource management in the region. As a key component in the local water system, the dam's importance lies in its contribution to fire protection, livestock, and aquatic habitats, emphasizing the interconnectedness of water resources, climate, and human activities in the area.