US Highway 101 NB over ST RTE 128 (canyon Rd)
FairSonoma County, California · 04-SON-101-R43.36 · Structure no. 20 0244R
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected April 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 145 ft
- 1 main span
- Daily traffic
- 14,250
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 NB over ST RTE 128 (canyon Rd) is a prestressed concrete box beam or girders - multiple carrying US Highway 101 NB over ST RTE 128 (canyon Rd) in Sonoma County, California. It was built in 1975, so it is 50 years old, younger 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 14,250 vehicles a day, roughly 11% of them trucks, projected to reach 27,201 by 2045. The structure is 145 ft (44.2 m) long and 41 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 NB over ST RTE 128 (canyon Rd) built?
It was built in 1975, making it 50 years old in 2025.
What condition is US Highway 101 NB over ST RTE 128 (canyon Rd) 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 April 2023.
How much traffic does US Highway 101 NB over ST RTE 128 (canyon Rd) carry?
About 14,250 vehicles per day (2017 count), of which roughly 11% are trucks.
How long is US Highway 101 NB over ST RTE 128 (canyon Rd)?
The structure is 145 ft (44.2 m) long with a longest span of 143 ft (43.5 m) and a deck 41 ft wide.
Who owns US Highway 101 NB over ST RTE 128 (canyon Rd)?
It is owned by the State Highway Agency.