Lower Derby
Key Takeaway
Lower Derby is classified as significant hazard in Colorado. It was completed in 1942 and is 84 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 20 ft (taller than 36.1% in CO) |
| Dam Length | 3,000 ft |
| Dam Type | Earth |
| Max Storage | 1.2K acre-ft |
| Normal Storage | 550 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 15,500 cfs |
| Year Completed | 1942 (84 years old) |
| NID ID | CO01902 |
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 Lower Derby?
Lower 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 Lower Derby?
Lower Derby is owned by Rocky Mountain Arsenal (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Derby built?
Lower 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 Lower Derby?
Lower Derby serves the following purposes: Irrigation, Fish And Wildlife Pond, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lower Derby?
Lower Derby has a dam height of 20 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 Lower Derby last inspected?
Lower Derby was last inspected on July 1, 2005. Inspection dates indicate when a formal review occurred, not the results of that inspection.