Naz Lake
Naz Lake is an earth dam located in Napa County, California, built in 1955. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Naz Lake
The primary purpose of Naz Lake 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 Huneeus-chantre Properties (private). It impounds the Tr Napa River.
The dam stands 29 feet tall and stretches 795 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1955, the structure is well into its service life at over 50 years old.
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 05/14/2025.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Napa River |
| Coordinates | 38.48510, -122.41440 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 795 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Huneeus-Chantre Properties |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/14/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00985 |
| Federal ID | CA00985 |
| More Info | State Dam Safety Program |