Marina Lagoon
California — San Mateo County — Belmount Slough
Location
| State | California |
| County | San Mateo |
| River | Belmount Slough |
| Coordinates | 37.56930, -122.29130 |
Physical Characteristics
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 350 ft |
| NID Storage | 1,600 acre-ft |
| Max Storage | 1,600 acre-ft |
| Surface Area | 200 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Satisfactory |
| EAP Status | No |
| Last Inspection | October 1, 2025 |
| Inspection Frequency | 0.5 |
Dam Information
| Year Completed | 1953 |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | City of San Mateo |
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.