Mt Tunnels Tailings Dam

Jefferson, Montana·

High Hazard Tailings Private

Key Takeaway

Mt Tunnels Tailings Dam is classified as high hazard in Montana. Its primary use is tailings. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Surface Area	256 acres
NID ID	MT03985

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes

State Regulated: Yes

Regulatory Agency: DEQ

Ownership

MONTANA TUNNELS MINING INC

Private

Nearby Dams

Park Lake Dam

Jefferson, MT

High Hazard 31 ft

Chessman Saddle Dam

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Chessman Main Dam

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High Hazard 57 ft

Scott Reservoir

Lewis and Clark, MT

High Hazard 32 ft

Frequently Asked Questions

What is the hazard classification of Mt Tunnels Tailings Dam?

Mt Tunnels Tailings Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Mt Tunnels Tailings Dam?

Mt Tunnels Tailings Dam is owned by MONTANA TUNNELS MINING INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Mt Tunnels Tailings Dam?

Mt Tunnels Tailings Dam serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.