US Highway 101 over 3rd ST 4th ST & 5th ST
FairSonoma County, California · 04-SON-101-20.09-SRO · Structure no. 20 0112
- Built
- 1968
- 57 years old, rebuilt 2009
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 758 ft
- 10 main spans
- Daily traffic
- 96,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 over 3rd ST 4th ST & 5th ST is a concrete continuous box beam or girders - multiple carrying US Highway 101 over 3rd ST 4th ST & 5th ST in Sonoma County, California. It was built in 1968 and reconstructed in 2009, so it is 57 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 5 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 96,000 vehicles a day, roughly 6% of them trucks, projected to reach 194,514 by 2044. The structure is 758 ft (231 m) long and 139 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 US Highway 101 over 3rd ST 4th ST & 5th ST built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2009.
What condition is US Highway 101 over 3rd ST 4th ST & 5th ST 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 August 2024.
How much traffic does US Highway 101 over 3rd ST 4th ST & 5th ST carry?
About 96,000 vehicles per day (2016 count), of which roughly 6% are trucks.
How long is US Highway 101 over 3rd ST 4th ST & 5th ST?
The structure is 758 ft (231 m) long with a longest span of 90 ft (27.4 m) and a deck 139 ft wide.
Who owns US Highway 101 over 3rd ST 4th ST & 5th ST?
It is owned by the State Highway Agency.