Sly Creek
Key Takeaway
Sly Creek is classified as high hazard in California. It was completed in 1961 and is 65 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 | 299 ft (taller than 98.2% in CA) |
| Dam Length | 1,200 ft |
| Dam Type | Earth |
| Max Storage | 65.7K acre-ft |
| Normal Storage | 65.1K acre-ft |
| Surface Area | 619 acres |
| Drainage Area | 24 sq mi |
| Max Discharge | 19,500 cfs |
| Year Completed | 1961 (65 years old) |
| NID ID | CA00272 |
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
South Feather Water and Power Agency
Public Utility
Nearby Dams
Lost Creek
Butte, CA
High Hazard 112 ftGrizzly Creek
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Significant Hazard 50 ftSouth Fork Diversion
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Low Hazard 60 ftSlate Creek
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Low Hazard 68 ftForbestown Diversion
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Low Hazard 81 ftLog Cabin
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High Hazard 53 ftLittle Grass Valley
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High Hazard 184 ftFrequently Asked Questions
What is the hazard classification of Sly Creek?
Sly Creek 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 Sly Creek?
Sly Creek is owned by South Feather Water and Power Agency (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Sly Creek built?
Sly Creek was completed in 1961, making it 65 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 Sly Creek?
Sly Creek serves the following purposes: Hydroelectric, Irrigation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Sly Creek?
Sly Creek has a dam height of 299 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 Sly Creek last inspected?
Sly Creek was last inspected on August 22, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.