Lake Helen
High HazardPoor ConditionEmergency Action Plan: Yes
Location
| County | Sonoma |
| Nearest City | N/A |
| River/Stream | Tr Russian Rv |
| Coordinates | 38.44810, -122.91320 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 355 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 192 acre-ft |
| Max Storage | 192 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Robert Maddocks |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 04/30/2025 |
| Emergency Action Plan | Yes |