Upper Derby
Key Takeaway
Upper Derby is classified as significant hazard in Colorado. It was completed in 1942 and is 84 years old. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 15 ft (taller than 20.1% in CO) |
| Dam Length | 1,400 ft |
| Dam Type | Earth |
| Max Storage | 620 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 87 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 40 cfs |
| Year Completed | 1942 (84 years old) |
| NID ID | CO01285 |
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
Rocky Mountain Arsenal
Federal Government
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High Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Upper Derby?
Upper Derby 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 Upper Derby?
Upper Derby is owned by Rocky Mountain Arsenal (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Derby built?
Upper Derby was completed in 1942, making it 84 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 Upper Derby?
Upper Derby serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Upper Derby?
Upper Derby has a dam height of 15 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 Upper Derby last inspected?
Upper Derby was last inspected on July 1, 1983. Inspection dates indicate when a formal review occurred, not the results of that inspection.