River Road over U.S. Highway 101
FairSonoma County, California · 04-SON-101-24.86 · Structure no. 20 0199
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 304 ft
- 4 main spans
- Daily traffic
- 9,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
River Road over U.S. Highway 101 is a concrete continuous box beam or girders - multiple carrying River Road over U.S. Highway 101 in Sonoma County, California. It was built in 1962, so it is 63 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 9,000 vehicles a day, roughly 2% of them trucks, projected to reach 10,512 by 2046. The structure is 304 ft (92.7 m) long and 40 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was River Road over U.S. Highway 101 built?
It was built in 1962, making it 63 years old in 2025.
What condition is River Road over U.S. Highway 101 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 River Road over U.S. Highway 101 carry?
About 9,000 vehicles per day (2016 count), of which roughly 2% are trucks.
How long is River Road over U.S. Highway 101?
The structure is 304 ft (92.7 m) long with a longest span of 102 ft (31.1 m) and a deck 40 ft wide.
Who owns River Road over U.S. Highway 101?
It is owned by the State Highway Agency.