Lake Ralphine
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | Sonoma |
| Nearest City | Santa Rosa |
| River/Stream | Tr Santa Rosa Cr |
| Coordinates | 38.45490, -122.67000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 700 ft |
| Year Completed | 1882 (144 years old) |
Storage & Hydraulics
| NID Storage | 387 acre-ft |
| Max Storage | 387 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Santa Rosa |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/05/2025 |
| Emergency Action Plan | Yes |