Antelope Valley Detention Dam

About Antelope Valley Detention Dam

The primary purpose of Antelope Valley Detention Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Doi Blm (federal). It impounds the Clayhole Wash near Saint George, Utah.

The dam stands 17 feet tall and stretches 1,380 feet across, creates a reservoir covering 37 acres, has a maximum storage capacity of 267 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1963, the structure is well into its service life at over 50 years old.

This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/21/2003. That was over 22 years ago.

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