Tiger Creek Afterbay
Key Takeaway
Tiger Creek Afterbay is classified as high hazard in California. It was completed in 1931 and is 95 years old. Its primary use is hydroelectric. 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 | 120 ft (taller than 85.7% in CA) |
| Dam Length | 448 ft |
| Dam Type | Concrete |
| Max Storage | 2.6K acre-ft |
| Normal Storage | 2.6K acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 357 sq mi |
| Max Discharge | 194,370 cfs |
| Year Completed | 1931 (95 years old) |
| NID ID | CA00401 |
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
Pacific Gas and Electric Company
Private
Nearby Dams
Tiger Creek Forebay
Amador, CA
Low Hazard 33 ftWest Point Regulating
Calaveras, CA
High Hazard 36 ftElectra Diversion
Amador, CA
Low Hazard 45 ftTiger Creek Regulator
Amador, CA
Significant Hazard 110 ftCpud Middle Fork
Calaveras, CA
High Hazard 102 ftJeff Davis
Calaveras, CA
High Hazard 114 ftRedhawk Lake
Calaveras, CA
High Hazard 33 ftReid
Calaveras, CA
Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Tiger Creek Afterbay?
Tiger Creek Afterbay 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 Tiger Creek Afterbay?
Tiger Creek 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 Tiger Creek Afterbay built?
Tiger Creek Afterbay was completed in 1931, making it 95 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 Tiger Creek Afterbay?
Tiger Creek 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 Tiger Creek Afterbay?
Tiger Creek Afterbay has a dam height of 120 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 Tiger Creek Afterbay last inspected?
Tiger Creek Afterbay was last inspected on July 11, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.