Jameson Vineyards
Jameson Vineyards is an earth dam located in Napa County, California. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Jameson Vineyards
The primary purpose of Jameson Vineyards 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 John Anthony Family Of Wines Napa Valley Llc (private). It impounds the Tr Fagan Creek.
The dam stands 41 feet tall and stretches 375 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 75 acre-feet, and collects water from a drainage area of 0 square miles.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/24/2025.
At 41 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Fagan Creek |
| Coordinates | 38.20390, -122.22190 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 375 ft |
Storage & Hydraulics
| NID Storage | 75 acre-ft |
| Max Storage | 75 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | John Anthony Family of Wines Napa Valley LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/24/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01417 |
| Federal ID | CA01417 |
| More Info | State Dam Safety Program |