U.S. Highway 101 over UP RR Spur
GoodSan Mateo County, California · 04-SM-101-21.80-SSF · Structure no. 35 0121
- Built
- 1948
- 77 years old, rebuilt 1969
- Condition
- Good
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 150 ft
- 3 main spans
- Daily traffic
- 188,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over UP RR Spur is a steel continuous stringer/multi-beam or girder carrying U.S. Highway 101 over UP RR Spur in San Mateo County, California. It was built in 1948 and reconstructed in 1969, so it is 77 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 188,000 vehicles a day, roughly 4% of them trucks, projected to reach 267,887 by 2040. The structure is 150 ft (45.7 m) long and 144 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over UP RR Spur built?
It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1969.
What condition is U.S. Highway 101 over UP RR Spur in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.
How much traffic does U.S. Highway 101 over UP RR Spur carry?
About 188,000 vehicles per day (2009 count), of which roughly 4% are trucks.
How long is U.S. Highway 101 over UP RR Spur?
The structure is 150 ft (45.7 m) long with a longest span of 54 ft (16.5 m) and a deck 144 ft wide.
Who owns U.S. Highway 101 over UP RR Spur?
It is owned by the State Highway Agency.