U.S. Highway 101 over Toll Plaza Undercrossing
FairSan Francisco County, California · 04-SF-101-9.85 · Structure no. 34 0069
- Built
- 1937
- 88 years old
- Condition
- Fair
- inspected March 2024
- Type
- Tee Beam
- Concrete
- Length
- 29 ft
- 1 main span
- Daily traffic
- 90,932
- 2023 count
- Owner
- Toll Authority
- Local Toll Authority
About this bridge
U.S. Highway 101 over Toll Plaza Undercrossing is a concrete tee beam carrying U.S. Highway 101 over Toll Plaza Undercrossing in San Francisco County, California. It was built in 1937, so it is 88 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 5 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 90,932 vehicles a day, roughly 1% of them trucks, projected to reach 110,000 by 2043. The structure is 29 ft (8.8 m) long and 291 ft wide. If it were closed, the detour would be 39.8 mi (64 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over Toll Plaza Undercrossing built?
It was built in 1937, making it 88 years old in 2025.
What condition is U.S. Highway 101 over Toll Plaza Undercrossing 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 March 2024.
How much traffic does U.S. Highway 101 over Toll Plaza Undercrossing carry?
About 90,932 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is U.S. Highway 101 over Toll Plaza Undercrossing?
The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.4 m) and a deck 291 ft wide.
Who owns U.S. Highway 101 over Toll Plaza Undercrossing?
It is owned by the Local Toll Authority.