Mill Lake

About Mill Lake

The primary purpose of Mill Lake is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Mill Creek Irr. (private). It impounds the Mill Creek near Victor.

The dam stands 25 feet tall and stretches 400 feet across, creates a reservoir covering 42 acres, has a storage capacity of 670 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1895, the structure is over a century 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. An emergency action plan is in place for this dam.

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

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