Gillespie
Key Takeaway
Gillespie is classified as significant hazard in Arizona. It was completed in 1921 and is 105 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 21 ft (taller than 32.9% in AZ) |
| Dam Length | 1,768 ft |
| Dam Type | Multi-Arch |
| Max Storage | 3.6K acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 4,965 sq mi |
| Max Discharge | 130,000 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | AZ00106 |
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
GILLESPIE DAM INVESTMENTS, LLC
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Gillespie?
Gillespie 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 Gillespie?
Gillespie is owned by GILLESPIE DAM INVESTMENTS, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Gillespie built?
Gillespie was completed in 1921, making it 105 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 Gillespie?
Gillespie 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 Gillespie?
Gillespie has a dam height of 21 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 Gillespie last inspected?
Gillespie was last inspected on September 24, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.