S101 on & Off Ramp over U.S. Highway 101
GoodMarin County, California · 04-MRN-101-25.50 · Structure no. 27 0115
- Built
- 2006
- 19 years old, rebuilt 2014
- Condition
- Good
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 253 ft
- 2 main spans
- Daily traffic
- 1,000
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
S101 on & Off Ramp over U.S. Highway 101 is a prestressed concrete continuous box beam or girders - multiple carrying S101 on & Off Ramp over U.S. Highway 101 in Marin County, California. It was built in 2006 and reconstructed in 2014, so it is 19 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 1,000 vehicles a day, roughly 40% of them trucks, projected to reach 1,287 by 2041. The structure is 253 ft (77.2 m) long and 44 ft wide. If it were closed, the detour would be 15.5 mi (25 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 S101 on & Off Ramp over U.S. Highway 101 built?
It was built in 2006, making it 19 years old in 2025. It was reconstructed in 2014.
What condition is S101 on & Off Ramp over U.S. Highway 101 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 S101 on & Off Ramp over U.S. Highway 101 carry?
About 1,000 vehicles per day (2007 count), of which roughly 40% are trucks.
How long is S101 on & Off Ramp over U.S. Highway 101?
The structure is 253 ft (77.2 m) long with a longest span of 139 ft (42.4 m) and a deck 44 ft wide.
Who owns S101 on & Off Ramp over U.S. Highway 101?
It is owned by the State Highway Agency.