Hourglass
Key Takeaway
Hourglass is classified as high hazard in Colorado. It was completed in 1898 and is 128 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 | 45 ft (taller than 85.3% in CO) |
| Dam Length | 2,400 ft |
| Dam Type | Earth |
| Max Storage | 2.2K acre-ft |
| Normal Storage | 1.7K acre-ft |
| Surface Area | 76 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 5,930 cfs |
| Year Completed | 1898 (128 years old) |
| NID ID | CO00138 |
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
CITY OF GREELEY DEPT. OF WATER RESOURCES (GUSTAFSO
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Hourglass?
Hourglass 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 Hourglass?
Hourglass is owned by CITY OF GREELEY DEPT. OF WATER RESOURCES (GUSTAFSO (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hourglass built?
Hourglass was completed in 1898, making it 128 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 Hourglass?
Hourglass serves the following purposes: Irrigation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hourglass?
Hourglass has a dam height of 45 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 Hourglass last inspected?
Hourglass was last inspected on August 3, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.