Cornwell
Key Takeaway
Cornwell is classified as significant hazard in Montana. It was completed in 1952 and is 74 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 23 ft (taller than 66.4% in MT) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 423 acre-ft |
| Normal Storage | 238 acre-ft |
| Drainage Area | 2 sq mi |
| Max Discharge | 600 cfs |
| Year Completed | 1952 (74 years old) |
| NID ID | MT00998 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CORNWELL RANCH
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Cornwell?
Cornwell is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Cornwell?
Cornwell is owned by CORNWELL RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cornwell built?
Cornwell was completed in 1952, making it 74 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 Cornwell?
Cornwell 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 Cornwell?
Cornwell has a dam height of 23 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.