Overnight Reservoir
Key Takeaway
Overnight Reservoir is classified as low hazard in Montana. It was completed in 1920 and is 106 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 17 ft (taller than 34.9% in MT) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 88 acre-ft |
| Normal Storage | 21 acre-ft |
| Year Completed | 1920 (106 years old) |
| NID ID | MT03323 |
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
BEAVERHEAD WATER CO
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Overnight Reservoir?
Overnight Reservoir 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 Overnight Reservoir?
Overnight Reservoir is owned by BEAVERHEAD WATER CO (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Overnight Reservoir built?
Overnight Reservoir was completed in 1920, making it 106 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 Overnight Reservoir?
Overnight Reservoir serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Overnight Reservoir?
Overnight Reservoir has a dam height of 17 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.