Lake Ann
Key Takeaway
Lake Ann is classified as high hazard in Colorado. It was completed in 1912 and is 114 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 40 ft (taller than 81.3% in CO) |
| Dam Length | 580 ft |
| Dam Type | Earth |
| Max Storage | 562 acre-ft |
| Normal Storage | 460 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,200 cfs |
| Year Completed | 1912 (114 years old) |
| Year Modified | 1953 |
| NID ID | CO00683 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
TYBAR RANCH CO. (BRENDAN DORAN)
Private
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Significant Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Lake Ann?
Lake Ann is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lake Ann?
Lake Ann is owned by TYBAR RANCH CO. (BRENDAN DORAN) (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Ann built?
Lake Ann was completed in 1912, making it 114 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 Lake Ann?
Lake Ann serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Ann?
Lake Ann has a dam height of 40 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 Lake Ann last inspected?
Lake Ann was last inspected on August 29, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.