Lone Tree Section 23 Tails Dam

About Lone Tree Section 23 Tails Dam

The primary purpose of Lone Tree Section 23 Tails Dam 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 Goldcorp Dee Llc (private). It impounds the Humboldt River-os near Golconda.

The dam stands 180 feet tall and stretches 9,622 feet across, creates a reservoir covering 245 acres, has a maximum storage capacity of 20,040 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1996, the structure is 30 years old.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/07/2022.

At 180 feet, this dam is taller than 99% of all dams in the United States.

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