Horse Mesa Dam

About Horse Mesa Dam

The primary purpose of Horse Mesa Dam is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Bureau Of Reclamation (federal). It impounds the Salt River.

The dam stands 305 feet tall and stretches 660 feet across, creates a reservoir covering 2,660 acres, has a maximum storage capacity of 261,335 acre-feet, and collects water from a drainage area of 5,913 square miles. Completed in 1927, the structure is well-established, with more than 75 years of service.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 04/05/2023.

At 305 feet, this dam is taller than 99% of all dams in the United States.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Arizona dam safety program can provide more specific information about emergency planning for this structure.

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