Lost Leg

TR-TONGUE RIVER· Rosebud, Montana· Built 1968· Earth· 32 ft tall

Key Takeaway

Lost Leg is classified as low hazard in Montana. It was completed in 1968 and is 58 years old. Its primary use is fire protection.

Physical Details

Dam Height 32 ft (taller than 90.8% in MT)
Dam Length240 ft
Dam TypeEarth
Max Storage47 acre-ft
Normal Storage25 acre-ft
Drainage Area1 sq mi
Max Discharge200 cfs
Year Completed1968 (58 years old)
NID IDMT01932

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
State Regulated: Yes
Regulatory Agency: DNRC

Ownership

CLINTON CLARK

Private

Frequently Asked Questions

What is the hazard classification of Lost Leg?

Lost Leg 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 Lost Leg?

Lost Leg is owned by CLINTON CLARK (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Lost Leg built?

Lost Leg was completed in 1968, making it 58 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Lost Leg?

Lost Leg serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Lost Leg?

Lost Leg has a dam height of 32 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

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.