Stevenson Ranch
Key Takeaway
Stevenson Ranch is classified as high hazard in California. It was completed in 2004 and is 22 years old. Its primary use is debris control. 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 | 54 ft (taller than 62.8% in CA) |
| Dam Length | 280 ft |
| Dam Type | Earth |
| Max Storage | 105 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 5 sq mi |
| Year Completed | 2004 (22 years old) |
| NID ID | CA01469 |
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
Los Angeles County Department Of Public Works
Local Government
Nearby Dams
Dry Canyon
Los Angeles, CA
High Hazard 66 ftUpper San Fernando
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Low Hazard 82 ftYarnell Debris Basin
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Low Hazard 42 ftChannel Diversion Dike
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Low Hazard 42 ftLos Angeles Reservoir
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High Hazard 130 ftLower Van Norman Bypass
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Low Hazard 78 ftLas Llajas
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High Hazard 96 ftSchoolhouse Debris Basin
Los Angeles, CA
High Hazard 38 ftFrequently Asked Questions
What is the hazard classification of Stevenson Ranch?
Stevenson Ranch 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 Stevenson Ranch?
Stevenson Ranch is owned by Los Angeles County Department Of Public Works (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Stevenson Ranch built?
Stevenson Ranch was completed in 2004, making it 22 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 Stevenson Ranch?
Stevenson Ranch serves the following purposes: Debris Control, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Stevenson Ranch?
Stevenson Ranch has a dam height of 54 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 Stevenson Ranch last inspected?
Stevenson Ranch was last inspected on October 20, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.