Preston Forebay
Key Takeaway
Preston Forebay is classified as low hazard in California. It was completed in 1892 and is 134 years old. Its primary use is other.
Physical Details
| Dam Height | 40 ft (taller than 46.3% in CA) |
| Dam Length | 176 ft |
| Dam Type | Earth |
| Max Storage | 30 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1892 (134 years old) |
| NID ID | CA00006 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Amador Regional Sanitation Authority
Public Utility
Nearby Dams
Preston
Amador, CA
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High Hazard 56 ftPond K
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Low Hazard 22 ftArroyo Seco
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High Hazard 67 ftJackson Creek
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High Hazard 193 ftFrequently Asked Questions
What is the hazard classification of Preston Forebay?
Preston Forebay is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Preston Forebay?
Preston Forebay is owned by Amador Regional Sanitation Authority (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Preston Forebay built?
Preston Forebay was completed in 1892, making it 134 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 Preston Forebay?
Preston Forebay serves the following purposes: Other, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Preston Forebay?
Preston Forebay has a dam height of 40 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 Preston Forebay last inspected?
Preston Forebay was last inspected on September 14, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.