U.S. Highway 101 over 2nd 3rd 4th 5th Mssn
FairMarin County, California · 04-MRN-101-10.72-SRF · Structure no. 27 0035L
- Built
- 1965
- 60 years old, rebuilt 2005
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 2,794 ft
- 22 main spans
- Daily traffic
- 64,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over 2nd 3rd 4th 5th Mssn is a concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over 2nd 3rd 4th 5th Mssn in Marin County, California. It was built in 1965 and reconstructed in 2005, so it is 60 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 6 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 64,500 vehicles a day, projected to reach 92,093 by 2046. The structure is 2,794 ft (851.6 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over 2nd 3rd 4th 5th Mssn built?
It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2005.
What condition is U.S. Highway 101 over 2nd 3rd 4th 5th Mssn 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 May 2024.
How much traffic does U.S. Highway 101 over 2nd 3rd 4th 5th Mssn carry?
About 64,500 vehicles per day (2009 count).
How long is U.S. Highway 101 over 2nd 3rd 4th 5th Mssn?
The structure is 2,794 ft (851.6 m) long with a longest span of 110 ft (33.5 m) and a deck 69 ft wide.
Who owns U.S. Highway 101 over 2nd 3rd 4th 5th Mssn?
It is owned by the State Highway Agency.