Alta Loma Basin #1
Key Takeaway
Alta Loma Basin #1 is classified as high hazard in California. It was completed in 1964 and is 62 years old. Its primary use is flood risk reduction. 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 | 30 ft (taller than 30.4% in CA) |
| Dam Length | 2,600 ft |
| Dam Type | Earth |
| Max Storage | 70 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 2 sq mi |
| Year Completed | 1964 (62 years old) |
| NID ID | CA00319 |
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
County of San Bernardino Department of Public Works
Local Government
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High Hazard 49 ftFrequently Asked Questions
What is the hazard classification of Alta Loma Basin #1?
Alta Loma Basin #1 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 Alta Loma Basin #1?
Alta Loma Basin #1 is owned by County of San Bernardino Department of Public Works (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Alta Loma Basin #1 built?
Alta Loma Basin #1 was completed in 1964, making it 62 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 Alta Loma Basin #1?
Alta Loma Basin #1 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Alta Loma Basin #1?
Alta Loma Basin #1 has a dam height of 30 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 Alta Loma Basin #1 last inspected?
Alta Loma Basin #1 was last inspected on February 17, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.