Harlowton Sewage Lagoon
Key Takeaway
Harlowton Sewage Lagoon is classified as low hazard in Montana. It was completed in 1958 and is 68 years old. Its primary use is other.
Physical Details
| Dam Height | 10 ft (taller than 3.7% in MT) |
| Dam Length | 4,565 ft |
| Dam Type | Earth |
| Max Storage | 190 acre-ft |
| Normal Storage | 129 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 21 sq mi |
| Max Discharge | 6 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | MT01416 |
Safety Information
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?
Ownership
CITY OF HARLOWTON
Local Government
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Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Harlowton Sewage Lagoon?
Harlowton Sewage Lagoon 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 Harlowton Sewage Lagoon?
Harlowton Sewage Lagoon is owned by CITY OF HARLOWTON (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Harlowton Sewage Lagoon built?
Harlowton Sewage Lagoon was completed in 1958, making it 68 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 Harlowton Sewage Lagoon?
Harlowton Sewage Lagoon serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Harlowton Sewage Lagoon?
Harlowton Sewage Lagoon has a dam height of 10 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.
When was Harlowton Sewage Lagoon last inspected?
Harlowton Sewage Lagoon was last inspected on May 10, 1979. Inspection dates indicate when a formal review occurred, not the results of that inspection.