Grand Mesa #9
Key Takeaway
Grand Mesa #9 is classified as low hazard in Colorado. It was completed in 1904 and is 122 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 15 ft (taller than 20.1% in CO) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 268 acre-ft |
| Normal Storage | 153 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 186 cfs |
| Year Completed | 1904 (122 years old) |
| NID ID | CO00828 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
GRAND MESA RESERVOIR CO.
Private
Nearby Dams
Grand Mesa #6
Mesa, CO
Low Hazard 16 ftGrand Mesa #8
Mesa, CO
Significant Hazard 21 ftMesa Creek #3
Mesa, CO
Significant Hazard 20 ftBasin #1
Delta, CO
Low Hazard 18 ftGlacier Spg Retaining Pond
Mesa, CO
Significant Hazard 13 ftMesa Creek #2
Mesa, CO
Low Hazard 15 ftMesa Creek #4
Mesa, CO
Significant Hazard 22 ftBasin #2
Delta, CO
Low Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Grand Mesa #9?
Grand Mesa #9 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Grand Mesa #9?
Grand Mesa #9 is owned by GRAND MESA RESERVOIR CO. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grand Mesa #9 built?
Grand Mesa #9 was completed in 1904, making it 122 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 Grand Mesa #9?
Grand Mesa #9 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 Grand Mesa #9?
Grand Mesa #9 has a dam height of 15 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 Grand Mesa #9 last inspected?
Grand Mesa #9 was last inspected on August 20, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.