State Route 131 over US Highway 101
GoodMarin County, California · 04-MRN-131-0.01 · Structure no. 27 0069
- Built
- 1956
- 69 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 222 ft
- 4 main spans
- Daily traffic
- 27,250
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 131 over US Highway 101 is a steel stringer/multi-beam or girder carrying State Route 131 over US Highway 101 in Marin County, California. It was built in 1956, so it is 69 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 27,250 vehicles a day, roughly 2% of them trucks, projected to reach 39,964 by 2042. The structure is 222 ft (67.8 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 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 State Route 131 over US Highway 101 built?
It was built in 1956, making it 69 years old in 2025.
What condition is State Route 131 over US 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 2024.
How much traffic does State Route 131 over US Highway 101 carry?
About 27,250 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is State Route 131 over US Highway 101?
The structure is 222 ft (67.8 m) long with a longest span of 78 ft (23.7 m) and a deck 66 ft wide.
Who owns State Route 131 over US Highway 101?
It is owned by the State Highway Agency.