Vonsen
California — Marin County — Tr San Antonio Cr
Location
| State | California |
| County | Marin |
| River | Tr San Antonio Cr |
| Coordinates | 38.18210, -122.67860 |
Physical Characteristics
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 402 ft |
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Surface Area | 9 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | December 11, 2025 |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1951 |
| Primary Purpose | Water Supply |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | Mary Volpi |
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.