Twin Lakes No. 1
Key Takeaway
Twin Lakes No. 1 is classified as high hazard in Wyoming. It was completed in 1998 and is 28 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 84 ft (taller than 97.7% in WY) |
| Dam Length | 1,835 ft |
| Dam Type | Earth |
| Max Storage | 4.0K acre-ft |
| Normal Storage | 3.4K acre-ft |
| Surface Area | 81 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 13,540 cfs |
| Year Completed | 1998 (28 years old) |
| NID ID | WY00647 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CITY OF SHERIDAN - TOM MANOLIS
Local Government
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High Hazard 74 ftFrequently Asked Questions
What is the hazard classification of Twin Lakes No. 1?
Twin Lakes No. 1 is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Twin Lakes No. 1?
Twin Lakes No. 1 is owned by CITY OF SHERIDAN - TOM MANOLIS (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twin Lakes No. 1 built?
Twin Lakes No. 1 was completed in 1998, making it 28 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 Twin Lakes No. 1?
Twin Lakes No. 1 serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Twin Lakes No. 1?
Twin Lakes No. 1 has a dam height of 84 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 Twin Lakes No. 1 last inspected?
Twin Lakes No. 1 was last inspected on June 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.