St. Helena Ler
California — Napa County — Tr Napa River
Location
| State | California |
| County | Napa |
| River | Tr Napa River |
| Coordinates | 38.50730, -122.49120 |
Physical Characteristics
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 856 ft |
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Surface Area | 12 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Poor |
| EAP Status | Yes |
| Last Inspection | June 11, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1878 |
| Primary Purpose | Water Supply |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | City of Saint Helena |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.