Donnelly #1
Key Takeaway
Donnelly #1 is classified as significant hazard in Colorado. It was completed in 1955 and is 71 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 | 270 ft |
| Dam Type | Earth |
| Max Storage | 428 acre-ft |
| Normal Storage | 283 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 588 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | CO00568 |
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
SURFACE CREEK DITCH & RESERVOIR CO. (WAIBEL, KEITH
Private
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Donnelly #1?
Donnelly #1 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 Donnelly #1?
Donnelly #1 is owned by SURFACE CREEK DITCH & RESERVOIR CO. (WAIBEL, KEITH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Donnelly #1 built?
Donnelly #1 was completed in 1955, making it 71 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 Donnelly #1?
Donnelly #1 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 Donnelly #1?
Donnelly #1 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 Donnelly #1 last inspected?
Donnelly #1 was last inspected on August 10, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.