Johnston

TR-PASTURE CREEK· Dawson, Montana· Built 1954· Earth· 30 ft tall
Low Hazard Fire Protection Stock Or Small Fish Pond Private

Key Takeaway

Johnston is classified as low hazard in Montana. It was completed in 1954 and is 72 years old. Its primary use is fire protection.

Physical Details

Dam Height 30 ft (taller than 82.7% in MT)
Dam Length600 ft
Dam TypeEarth
Max Storage30 acre-ft
Normal Storage25 acre-ft
Year Completed1954 (72 years old)
NID IDMT00452

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

HELEN HOFFMAN

Private

Nearby Dams

Richey, Roy

Dawson, MT

Low Hazard 20 ft

Lee Sa #2

Richland, MT

Low Hazard 30 ft

H S Dam

Richland, MT

Low Hazard 18 ft

Dean S #2

Dawson, MT

Low Hazard 20 ft

Johnstone Pasture

Dawson, MT

Low Hazard 18 ft

Lee, S.A. #1

Dawson, MT

Low Hazard 22 ft

Bahls

Richland, MT

Low Hazard 10 ft

Circle Reservoir

Dawson, MT

Low Hazard 15 ft

Frequently Asked Questions

What is the hazard classification of Johnston?

Johnston 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 Johnston?

Johnston is owned by HELEN HOFFMAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Johnston built?

Johnston was completed in 1954, making it 72 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 Johnston?

Johnston 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 Johnston?

Johnston has a dam height of 30 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.