Little Willow
Key Takeaway
Little Willow is classified as low hazard in Wyoming. It was completed in 1906 and is 120 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 10 ft (taller than 3.3% in WY) |
| Dam Length | 910 ft |
| Dam Type | Earth |
| Max Storage | 216 acre-ft |
| Normal Storage | 108 acre-ft |
| Surface Area | 54 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1906 (120 years old) |
| NID ID | WY00135 |
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
9H ANGUS RANCH
Private
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Low Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Little Willow?
Little Willow 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 Little Willow?
Little Willow is owned by 9H ANGUS RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Little Willow built?
Little Willow was completed in 1906, making it 120 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 Little Willow?
Little Willow 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 Little Willow?
Little Willow has a dam height of 10 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 Little Willow last inspected?
Little Willow was last inspected on April 21, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.