Lake Helen
California — Sonoma County — Tr Russian Rv
Location
| State | California |
| County | Sonoma |
| River | Tr Russian Rv |
| Coordinates | 38.44810, -122.91320 |
Physical Characteristics
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 355 ft |
| NID Storage | 192 acre-ft |
| Max Storage | 192 acre-ft |
| Surface Area | 14 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Poor |
| EAP Status | Yes |
| Last Inspection | April 30, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1966 |
| Primary Purpose | Water Supply |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | Robert Maddocks |
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.