Caballo Arroyo Dam No. 1

About Caballo Arroyo Dam No. 1

The primary purpose of Caballo Arroyo Dam No. 1 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Caballo Soil & Water Conservation District (local government). It impounds the Underwood Arroyo near Rural Business.

The dam stands 36 feet tall and stretches 800 feet across, has a maximum storage capacity of 79 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.

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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 06/02/2015. That was 10 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.

At 36 feet, this dam is taller than 83% of dams nationwide.

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 New Mexico dam safety program can provide more specific information about emergency planning for this structure.

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