Polaris
Key Takeaway
Polaris is classified as significant hazard in Wyoming. It was completed in 1909 and is 117 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 41 ft (taller than 89.1% in WY) |
| Dam Length | 1,071 ft |
| Dam Type | Earth |
| Max Storage | 687 acre-ft |
| Normal Storage | 608 acre-ft |
| Surface Area | 57 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1909 (117 years old) |
| NID ID | WY00047 |
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
TERRY GRAZING ASSOCIATION
Private
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Low Hazard 35 ftFrequently Asked Questions
What is the hazard classification of Polaris?
Polaris 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 Polaris?
Polaris is owned by TERRY GRAZING ASSOCIATION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Polaris built?
Polaris 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 Polaris?
Polaris 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 Polaris?
Polaris has a dam height of 41 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 Polaris last inspected?
Polaris was last inspected on May 10, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.