Long Tom

About Long Tom

The primary purpose of Long Tom is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is private-owned. It impounds the Long Tom Creek Canyon Creek near Mountain Home.

The dam stands 60 feet tall and stretches 450 feet across, creates a reservoir covering 158 acres, has a storage capacity of 3,600 acre-feet, and collects water from a drainage area of 27 square miles. Completed in 1906, the structure is over a century 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 05/10/2018.

At 60 feet, this dam is taller than 95% of all dams in the United States.

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