Granby #7
Key Takeaway
Granby #7 is classified as low hazard in Colorado. It was completed in 1964 and is 62 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 17 ft (taller than 26.3% in CO) |
| Dam Length | 390 ft |
| Dam Type | Earth |
| Max Storage | 151 acre-ft |
| Normal Storage | 76 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 588 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | CO00718 |
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
GRANBY DITCH & RESERVOIR CO. (THOMPSON, BRIAN)
Private
Nearby Dams
Granby #6
Delta, CO
Low Hazard 17 ftGranby #12
Delta, CO
High Hazard 27 ftBig Battlement
Delta, CO
High Hazard 23 ftBasin #2
Delta, CO
Low Hazard 15 ftGranby #5-11
Delta, CO
High Hazard 30 ftBasin #1
Delta, CO
Low Hazard 18 ftGrand Mesa #9
Mesa, CO
Low Hazard 15 ftScotland Peak
Delta, CO
Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Granby #7?
Granby #7 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 Granby #7?
Granby #7 is owned by GRANBY DITCH & RESERVOIR CO. (THOMPSON, BRIAN) (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Granby #7 built?
Granby #7 was completed in 1964, making it 62 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 Granby #7?
Granby #7 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 Granby #7?
Granby #7 has a dam height of 17 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 Granby #7 last inspected?
Granby #7 was last inspected on July 19, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.