Annis
Key Takeaway
Annis is classified as low hazard in Wyoming. It was completed in 1948 and is 78 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 25 ft (taller than 39.5% in WY) |
| Dam Length | 130 ft |
| Dam Type | Earth |
| Max Storage | 332 acre-ft |
| Normal Storage | 166 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1948 (78 years old) |
| NID ID | WY00405 |
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
ANNIS RANCH TRUST
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Annis?
Annis 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 Annis?
Annis is owned by ANNIS RANCH TRUST (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Annis built?
Annis was completed in 1948, making it 78 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 Annis?
Annis 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 Annis?
Annis has a dam height of 25 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 Annis last inspected?
Annis was last inspected on September 23, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.