Dennis No. 2
Key Takeaway
Dennis No. 2 is classified as low hazard in California. It was completed in 1997 and is 29 years old. Its primary use is water supply.
Physical Details
| Dam Height | 60 ft (taller than 67.2% in CA) |
| Dam Length | 550 ft |
| Dam Type | Earth |
| Max Storage | 148 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1997 (29 years old) |
| NID ID | CA01398 |
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
E & J Gallo Winery
Private
Nearby Dams
Cook No. 2
Sonoma, CA
High Hazard 35 ftCoen C-3
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Low Hazard 97 ftNorton No. 2
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High Hazard 28 ftLytton
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High Hazard 34 ftFoss Creek North Area
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High Hazard 20 ftBudge
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Significant Hazard 28 ftHealdsburg Recreation
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Low Hazard 15 ftVineyard Subdivision
Sonoma, CA
Significant Hazard 26 ftFrequently Asked Questions
What is the hazard classification of Dennis No. 2?
Dennis No. 2 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 Dennis No. 2?
Dennis No. 2 is owned by E & J Gallo Winery (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Dennis No. 2 built?
Dennis No. 2 was completed in 1997, making it 29 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 Dennis No. 2?
Dennis No. 2 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 Dennis No. 2?
Dennis No. 2 has a dam height of 60 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 Dennis No. 2 last inspected?
Dennis No. 2 was last inspected on August 24, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.