Decoto Reservoir
Key Takeaway
Decoto Reservoir is classified as high hazard in California. It was completed in 1966 and is 60 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 | 33 ft (taller than 35.9% in CA) |
| Dam Length | 1,360 ft |
| Dam Type | Earth |
| Max Storage | 46 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1966 (60 years old) |
| NID ID | CA00898 |
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
Alameda County Water District
Local Government
Nearby Dams
Quarry Pits
Alameda, CA
High Hazard 26 ftShinn
Alameda, CA
Significant Hazard 45 ftRubber Dam 3
Alameda, CA
Significant Hazard 17 ftMiddlefield Reservoir
Alameda, CA
High Hazard 147 ftPatterson
Alameda, CA
Significant Hazard 100 ftWard Creek
Alameda, CA
High Hazard 71 ftSan Lorenzo Creek
Alameda, CA
High Hazard 65 ftCull Creek
Alameda, CA
High Hazard 55 ftFrequently Asked Questions
What is the hazard classification of Decoto Reservoir?
Decoto 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 Decoto Reservoir?
Decoto Reservoir is owned by Alameda County Water District (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Decoto Reservoir built?
Decoto Reservoir was completed in 1966, making it 60 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 Decoto Reservoir?
Decoto 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 Decoto Reservoir?
Decoto Reservoir has a dam height of 33 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 Decoto Reservoir last inspected?
Decoto Reservoir was last inspected on October 26, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.