Petersburg Upper Dam
Key Takeaway
Petersburg Upper Dam is classified as significant hazard in Alaska. It was completed in 1950 and is 76 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 23 ft (taller than 40% in AK) |
| Dam Length | 286 ft |
| Dam Type | Other |
| Max Storage | 142 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 2,000 cfs |
| Year Completed | 1950 (76 years old) |
| NID ID | AK00016 |
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
CITY OF PETERSBURG
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Petersburg Upper Dam?
Petersburg Upper Dam 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 Petersburg Upper Dam?
Petersburg Upper Dam is owned by CITY OF PETERSBURG (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Petersburg Upper Dam built?
Petersburg Upper Dam was completed in 1950, making it 76 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 Petersburg Upper Dam?
Petersburg Upper Dam 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 Petersburg Upper Dam?
Petersburg Upper Dam has a dam height of 23 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 Petersburg Upper Dam last inspected?
Petersburg Upper Dam was last inspected on September 17, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.