Twin Lakes No 1
Key Takeaway
Twin Lakes No 1 is classified as high hazard in Pennsylvania. It was completed in 1908 and is 118 years old. Its primary use is recreation. 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 | 31 ft (taller than 66.7% in PA) |
| Dam Length | 950 ft |
| Dam Type | Earth |
| Max Storage | 470 acre-ft |
| Normal Storage | 340 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 2 sq mi |
| Year Completed | 1908 (118 years old) |
| NID ID | PA00487 |
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
WESTMORELAND COUNTY COMMISSIONERS
Local Government
Nearby Dams
Twin Lakes No 2
Westmoreland, PA
High Hazard 34 ftRidilla Upper Pond A
Westmoreland, PA
Significant Hazard 15 ftGreenwalt
Westmoreland, PA
Significant Hazard 27 ftEidemiller Lake
Westmoreland, PA
High Hazard 22 ftTownship Line
Westmoreland, PA
High Hazard 56 ftLonesome Lake
Westmoreland, PA
Low Hazard 24 ftKeystone State Park
Westmoreland, PA
Significant Hazard 45 ftMannitto
Westmoreland, PA
Low Hazard 18 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 WESTMORELAND COUNTY COMMISSIONERS (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 1908, making it 118 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: Recreation. 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 31 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 August 22, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.