U.S. Highway 101 over San Antonio Creek
GoodMarin County, California · 04-MRN-101-27.53 · Structure no. 27 0119
- Built
- 2019
- 6 years old
- Condition
- Good
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 510 ft
- 4 main spans
- Daily traffic
- 96,600
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over San Antonio Creek is a prestressed concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over San Antonio Creek in Marin County, California. It was built in 2019, so it is 6 years old, younger 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 96,600 vehicles a day, roughly 5% of them trucks, projected to reach 125,723 by 2043. The structure is 510 ft (155.4 m) long and 122 ft wide. If it were closed, the detour would be 4.3 mi (7 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. |
| Channel and channel protection | 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 San Antonio Creek built?
It was built in 2019, making it 6 years old in 2025.
What condition is U.S. Highway 101 over San Antonio Creek 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 2023.
How much traffic does U.S. Highway 101 over San Antonio Creek carry?
About 96,600 vehicles per day (2017 count), of which roughly 5% are trucks.
How long is U.S. Highway 101 over San Antonio Creek?
The structure is 510 ft (155.4 m) long with a longest span of 155 ft (47.2 m) and a deck 122 ft wide.
Who owns U.S. Highway 101 over San Antonio Creek?
It is owned by the State Highway Agency.