Spencer Lake
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| County | San Mateo |
| Nearest City | Hillsborough |
| River/Stream | Tr S Francisco Bay |
| Coordinates | 37.57050, -122.37900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 87 ft |
| Dam Height | 87 ft |
| Dam Length | 400 ft |
| Year Completed | 1876 (150 years old) |
Storage & Hydraulics
| NID Storage | 73 acre-ft |
| Max Storage | 73 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Town of Hillsborough |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/05/2025 |
| Emergency Action Plan | Yes |