Hannah Mahoney No. 2
Key Takeaway
Hannah Mahoney No. 2 is classified as low hazard in Wyoming. It was completed in 1909 and is 117 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 22 ft (taller than 28.8% in WY) |
| Dam Length | 590 ft |
| Dam Type | Earth |
| Max Storage | 107 acre-ft |
| Normal Storage | 74 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1909 (117 years old) |
| Year Modified | 2001 |
| NID ID | WY00378 |
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
FERRIS MOUNTAIN RANCH
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Hannah Mahoney No. 2?
Hannah Mahoney No. 2 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 Hannah Mahoney No. 2?
Hannah Mahoney No. 2 is owned by FERRIS MOUNTAIN RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hannah Mahoney No. 2 built?
Hannah Mahoney No. 2 was completed in 1909, making it 117 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 Hannah Mahoney No. 2?
Hannah Mahoney No. 2 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 Hannah Mahoney No. 2?
Hannah Mahoney No. 2 has a dam height of 22 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 Hannah Mahoney No. 2 last inspected?
Hannah Mahoney No. 2 was last inspected on October 5, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.