Jones #1
Key Takeaway
Jones #1 is classified as significant hazard in Colorado. It was completed in 1879 and is 147 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 27 ft (taller than 59.3% in CO) |
| Dam Length | 340 ft |
| Dam Type | Earth |
| Max Storage | 295 acre-ft |
| Normal Storage | 241 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 115 cfs |
| Year Completed | 1879 (147 years old) |
| NID ID | CO01703 |
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
GRAND RIVER RANCH OWNERS ASSOC. (CULBREATH, RANCH
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Jones #1?
Jones #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 Jones #1?
Jones #1 is owned by GRAND RIVER RANCH OWNERS ASSOC. (CULBREATH, RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jones #1 built?
Jones #1 was completed in 1879, making it 147 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 Jones #1?
Jones #1 serves the following purposes: Water Supply, Fire Protection, Stock, Or Small Fish Pond, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Jones #1?
Jones #1 has a dam height of 27 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 Jones #1 last inspected?
Jones #1 was last inspected on August 4, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.