US Highway 101 over Ninth Street
FairSonoma County, California · 04-SON-101-20.48-SRO · Structure no. 20 0134
- Built
- 1968
- 57 years old, rebuilt 2009
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 151 ft
- 3 main spans
- Daily traffic
- 96,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 over Ninth Street is a concrete continuous box beam or girders - multiple carrying US Highway 101 over Ninth Street 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 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 96,000 vehicles a day, roughly 6% of them trucks, projected to reach 190,669 by 2042. The structure is 151 ft (46 m) long and 136 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 | 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 Ninth Street 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 Ninth Street 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 Ninth Street carry?
About 96,000 vehicles per day (2016 count), of which roughly 6% are trucks.
How long is US Highway 101 over Ninth Street?
The structure is 151 ft (46 m) long with a longest span of 91 ft (27.7 m) and a deck 136 ft wide.
Who owns US Highway 101 over Ninth Street?
It is owned by the State Highway Agency.