Grizzly
Key Takeaway
Grizzly is classified as high hazard in Colorado. It was completed in 1930 and is 96 years old. Its primary use is recreation. 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 | 56 ft (taller than 90.4% in CO) |
| Dam Length | 792 ft |
| Dam Type | Rockfill |
| Max Storage | 987 acre-ft |
| Normal Storage | 590 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 3,350 cfs |
| Year Completed | 1930 (96 years old) |
| NID ID | CO01545 |
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
TWIN LAKES RESERVOIR AND CANAL COMPANY (HUGHES, BR
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Grizzly?
Grizzly 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 Grizzly?
Grizzly is owned by TWIN LAKES RESERVOIR AND CANAL COMPANY (HUGHES, BR (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grizzly built?
Grizzly was completed in 1930, making it 96 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 Grizzly?
Grizzly serves the following purposes: Recreation, Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grizzly?
Grizzly has a dam height of 56 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 Grizzly last inspected?
Grizzly was last inspected on August 31, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.