Upper North Tisdale No. 1
Key Takeaway
Upper North Tisdale No. 1 is classified as low hazard in Wyoming. It was completed in 1999 and is 27 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 17 ft (taller than 15% in WY) |
| Dam Length | 1,969 ft |
| Dam Type | Earth |
| Max Storage | 271 acre-ft |
| Normal Storage | 228 acre-ft |
| Surface Area | 63 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 8,030 cfs |
| Year Completed | 1999 (27 years old) |
| NID ID | WY02226 |
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
BLACKJEWEL LLC ATTN: TAMMY OKRAY
Private
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Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Upper North Tisdale No. 1?
Upper North Tisdale No. 1 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 Upper North Tisdale No. 1?
Upper North Tisdale No. 1 is owned by BLACKJEWEL LLC ATTN: TAMMY OKRAY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper North Tisdale No. 1 built?
Upper North Tisdale No. 1 was completed in 1999, making it 27 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 Upper North Tisdale No. 1?
Upper North Tisdale No. 1 serves the following purposes: Flood Risk Reduction, Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Upper North Tisdale No. 1?
Upper North Tisdale No. 1 has a dam height of 17 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 Upper North Tisdale No. 1 last inspected?
Upper North Tisdale No. 1 was last inspected on August 7, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.