U.S. Highway 101 over Wornum Drive
GoodMarin County, California · 04-MRN-101-8.02-CMAD · Structure no. 27 0009
- Built
- 1929
- 96 years old, rebuilt 1975
- Condition
- Good
- inspected May 2024
- Type
- Tee Beam
- Concrete
- Length
- 141 ft
- 4 main spans
- Daily traffic
- 172,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over Wornum Drive is a concrete tee beam carrying U.S. Highway 101 over Wornum Drive in Marin County, California. It was built in 1929 and reconstructed in 1975, so it is 96 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 172,000 vehicles a day, roughly 2% of them trucks, projected to reach 225,945 by 2042. The structure is 141 ft (43 m) long and 134 ft wide. If it were closed, the detour would be 1.9 mi (3 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 Wornum Drive built?
It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1975.
What condition is U.S. Highway 101 over Wornum Drive 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 May 2024.
How much traffic does U.S. Highway 101 over Wornum Drive carry?
About 172,000 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is U.S. Highway 101 over Wornum Drive?
The structure is 141 ft (43 m) long with a longest span of 43 ft (13.1 m) and a deck 134 ft wide.
Who owns U.S. Highway 101 over Wornum Drive?
It is owned by the State Highway Agency.