Long Horn #1 Dam

INTERMITTENT· Valley, Montana· Gravity·
Low Hazard Federal Government

Key Takeaway

Long Horn #1 Dam is classified as low hazard in Montana.

Physical Details

Dam Length681 ft
Dam TypeGravity
Max Storage100 acre-ft
Normal Storage34 acre-ft
Surface Area14 acres
Drainage Area0 sq mi
NID IDMT03019

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

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

Emergency Action Plan: No
Last Inspection: September 1, 2017
State Regulated: No

Ownership

DOI BLM

Federal Government

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Long Horn #1 Dam?

Long Horn #1 Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Long Horn #1 Dam?

Long Horn #1 Dam is owned by DOI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Long Horn #1 Dam last inspected?

Long Horn #1 Dam was last inspected on September 1, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.

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.