Patterson, a privately owned dam in Woodruff, Arizona, serves multiple purposes including fire protection and providing water for stock or small fish ponds. Completed in 1944, this earth dam stands at a height of 16.5 feet and has a storage capacity of 533.8 acre-feet. Located on the Mail Station Draw river, Patterson plays a crucial role in the local water resource management by regulating water flow and storing essential supplies for various needs.

Managed by the Arizona Department of Water Resources, Patterson is subject to state regulations, inspections, and enforcement to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating of 3, the dam has not been rated for its condition but is deemed to be in a satisfactory state. While it lacks certain emergency preparedness features like an Emergency Action Plan (EAP) and inundation maps, the dam's risk management measures are currently unspecified.

Despite its age, Patterson continues to be a vital asset for water resource management in Apache County, Arizona. With a focus on safety and compliance, state regulators oversee the dam's operations and maintenance to ensure its continued functionality and resilience in the face of potential risks and emergencies. For water resource and climate enthusiasts, Patterson serves as a fascinating example of how infrastructure can adapt and evolve to meet the changing needs of a growing community while maintaining a commitment to sustainability and safety.