U.S. Highway 101 over Arroyo De San Jose
FairMarin County, California · 04-MRN-101-18.15 · Structure no. 27 0003
- Built
- 1928
- 97 years old, rebuilt 1964
- Condition
- Fair
- inspected April 2023
- Type
- Tee Beam
- Concrete
- Length
- 28 ft
- 1 main span
- Daily traffic
- 139,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over Arroyo De San Jose is a concrete tee beam carrying U.S. Highway 101 over Arroyo De San Jose in Marin County, California. It was built in 1928 and reconstructed in 1964, so it is 97 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 139,000 vehicles a day, roughly 4% of them trucks, projected to reach 194,297 by 2045. The structure is 28 ft (8.5 m) long and 240 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over Arroyo De San Jose built?
It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1964.
What condition is U.S. Highway 101 over Arroyo De San Jose 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 April 2023.
How much traffic does U.S. Highway 101 over Arroyo De San Jose carry?
About 139,000 vehicles per day (2009 count), of which roughly 4% are trucks.
How long is U.S. Highway 101 over Arroyo De San Jose?
The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 240 ft wide.
Who owns U.S. Highway 101 over Arroyo De San Jose?
It is owned by the State Highway Agency.