Cook Reservoir in Graham, Arizona, is a state-regulated water supply reservoir managed by the Arizona Department of Water Resources. This Earth-type dam, completed in 1940, stands at a height of 18 feet and has a storage capacity of 59 acre-feet. With a surface area of 17 acres and a drainage area of 1.34 square miles, Cook Reservoir plays a crucial role in providing water to the surrounding area.

Despite its important role in water supply, Cook Reservoir has a high hazard potential and an unsatisfactory condition assessment. With a risk assessment rating of 2 (high risk), the reservoir requires close monitoring and management to ensure the safety of nearby communities. Although the spillway type is listed as "None," the reservoir's last inspection in January 2021 highlights the need for regular assessments and potential improvements to reduce risk and enhance overall safety.

Located in Safford and under the jurisdiction of the state of Arizona, Cook Reservoir serves as a vital water resource for the area. As a water supply dam, it is essential for sustaining local water needs. However, with its high hazard potential and unsatisfactory condition assessment, ongoing management and risk mitigation measures are crucial to ensure the reservoir's continued safe operation and the protection of surrounding communities.