Dennis No. 2
Dennis No. 2 is an earth dam located in Sonoma County, California, built in 1997. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Dennis No. 2
The primary purpose of Dennis No. 2 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by E & J Gallo Winery (private). It impounds the Tr Dry Creek.
The dam stands 60 feet tall and stretches 550 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 148 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1997, the structure is 29 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 02/05/2025.
At 60 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Tr Dry Creek |
| Coordinates | 38.66590, -122.90340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 60 ft |
| Dam Height | 60 ft |
| Dam Length | 550 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 148 acre-ft |
| Max Storage | 148 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | E & J Gallo Winery |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/05/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01398 |
| Federal ID | CA01398 |
| More Info | State Dam Safety Program |