4-S Ranch Reclamation Reservoir
Key Takeaway
4-S Ranch Reclamation Reservoir is classified as high hazard in California. It was completed in 2000 and is 26 years old. Its primary use is water supply. 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 | 22 ft (taller than 18.8% in CA) |
| Dam Length | 1,270 ft |
| Dam Type | Earth |
| Max Storage | 410 acre-ft |
| Surface Area | 13 acres |
| Year Completed | 2000 (26 years old) |
| NID ID | CA01446 |
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
Olivenhain Municipal Water District
Public Utility
Nearby Dams
Upper 4s Ranch
San Diego, CA
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High Hazard 309 ftFairbanks
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High Hazard 51 ftFrequently Asked Questions
What is the hazard classification of 4-S Ranch Reclamation Reservoir?
4-S Ranch Reclamation Reservoir 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 4-S Ranch Reclamation Reservoir?
4-S Ranch Reclamation Reservoir is owned by Olivenhain Municipal Water District (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was 4-S Ranch Reclamation Reservoir built?
4-S Ranch Reclamation Reservoir was completed in 2000, making it 26 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 4-S Ranch Reclamation Reservoir?
4-S Ranch Reclamation Reservoir serves the following purposes: Water Supply, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is 4-S Ranch Reclamation Reservoir?
4-S Ranch Reclamation Reservoir has a dam height of 22 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 4-S Ranch Reclamation Reservoir last inspected?
4-S Ranch Reclamation Reservoir was last inspected on March 24, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.