Lake William
California — Napa County — Tr Milliken Cr
Location
| State | California |
| County | Napa |
| River | Tr Milliken Cr |
| Coordinates | 38.36170, -122.22310 |
Physical Characteristics
| NID Height | 66 ft |
| Dam Height | 66 ft |
| Dam Length | 575 ft |
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Surface Area | 16 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | No |
| Last Inspection | September 17, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1960 |
| Primary Purpose | Water Supply |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | William E. Jarvis |
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.