Thebes Lake
Key Takeaway
Thebes Lake is classified as low hazard in Montana. It was completed in 1913 and is 113 years old. Its primary use is other.
Physical Details
| Dam Height | 16 ft (taller than 31.7% in MT) |
| Dam Length | 1,100 ft |
| Dam Type | Earth |
| Max Storage | 94 acre-ft |
| Normal Storage | 40 acre-ft |
| Year Completed | 1913 (113 years old) |
| NID ID | MT02424 |
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
WILLIAM MAGELSSEN, ESTATE OF
Private
Nearby Dams
L Olson #1
Rosebud, MT
Low Hazard 12 ftMontana #19
Rosebud, MT
Low Hazard 20 ftMontana #18
Rosebud, MT
Low Hazard 15 ftBassett
Treasure, MT
Low Hazard 10 ftSun Coulee
Rosebud, MT
Low Hazard 27 ftKniepp #1
Rosebud, MT
Low Hazard 18 ftBig Timber #37
Rosebud, MT
Low Hazard 10 ftBig Timber #20
Rosebud, MT
Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Thebes Lake?
Thebes Lake 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 Thebes Lake?
Thebes Lake is owned by WILLIAM MAGELSSEN, ESTATE OF (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thebes Lake built?
Thebes Lake was completed in 1913, making it 113 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 Thebes Lake?
Thebes Lake 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 Thebes Lake?
Thebes Lake has a dam height of 16 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.