Pit No. 7 Afterbay
Key Takeaway
Pit No. 7 Afterbay is classified as significant hazard in California. It was completed in 1965 and is 61 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 25 ft (taller than 23.6% in CA) |
| Dam Type | Rockfill |
| Normal Storage | 1 acre-ft |
| Drainage Area | 4,897 sq mi |
| Max Discharge | 115,000 cfs |
| Year Completed | 1965 (61 years old) |
| NID ID | CA82569 |
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
Pacific Gas and Electric Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Pit No. 7 Afterbay?
Pit No. 7 Afterbay 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 Pit No. 7 Afterbay?
Pit No. 7 Afterbay is owned by Pacific Gas and Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pit No. 7 Afterbay built?
Pit No. 7 Afterbay was completed in 1965, making it 61 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 Pit No. 7 Afterbay?
Pit No. 7 Afterbay serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Pit No. 7 Afterbay?
Pit No. 7 Afterbay has a dam height of 25 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 Pit No. 7 Afterbay last inspected?
Pit No. 7 Afterbay was last inspected on August 1, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.