U.S. Highway 101 over UP RR Spur
FairSan Mateo County, California · 04-SM-101-5.50-RDWC · Structure no. 35 0065
- Built
- 1958
- 67 years old, rebuilt 1972
- Condition
- Fair
- inspected August 2023
- Type
- Slab
- Concrete Continuous
- Length
- 132 ft
- 3 main spans
- Daily traffic
- 195,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over UP RR Spur is a concrete continuous slab carrying U.S. Highway 101 over UP RR Spur in San Mateo County, California. It was built in 1958 and reconstructed in 1972, so it is 67 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 195,000 vehicles a day, roughly 5% of them trucks, projected to reach 261,291 by 2045. The structure is 132 ft (40.2 m) long and 216 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 1958, making it 67 years old in 2025. It was reconstructed in 1972.
What condition is U.S. Highway 101 over UP RR Spur in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does U.S. Highway 101 over UP RR Spur carry?
About 195,000 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is U.S. Highway 101 over UP RR Spur?
The structure is 132 ft (40.2 m) long with a longest span of 44 ft (13.4 m) and a deck 216 ft wide.
Who owns U.S. Highway 101 over UP RR Spur?
It is owned by the State Highway Agency.