Lyman Dam
Key Takeaway
Lyman Dam is classified as high hazard in Arizona. It was completed in 1912 and is 114 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 | 60 ft (taller than 82.7% in AZ) |
| Dam Length | 800 ft |
| Dam Type | Rockfill |
| Max Storage | 44.5K acre-ft |
| Normal Storage | 30.6K acre-ft |
| Surface Area | 1,324 acres |
| Drainage Area | 790 sq mi |
| Max Discharge | 15,000 cfs |
| Year Completed | 1912 (114 years old) |
| NID ID | AZ00004 |
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
ARIZONA STATE PARKS;GROVERS HILL IRRIGATION DISTRICT
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Lyman Dam?
Lyman Dam 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 Lyman Dam?
Lyman Dam is owned by ARIZONA STATE PARKS;GROVERS HILL IRRIGATION DISTRICT (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lyman Dam built?
Lyman Dam was completed in 1912, making it 114 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 Lyman Dam?
Lyman Dam serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lyman Dam?
Lyman Dam has a dam height of 60 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 Lyman Dam last inspected?
Lyman Dam was last inspected on September 28, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.