State Route 128 over Oat Valley Creek
FairSonoma County, California · 04-SON-128-L4.64 · Structure no. 20 0033
- Built
- 1932
- 93 years old, rebuilt 1987
- Condition
- Fair
- inspected April 2023
- Type
- Slab
- Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 2,550
- 2013 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 128 over Oat Valley Creek is a concrete slab carrying State Route 128 over Oat Valley Creek in Sonoma County, California. It was built in 1932 and reconstructed in 1987, so it is 93 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 2,550 vehicles a day, roughly 8% of them trucks, projected to reach 2,426 by 2045. The structure is 24 ft (7.3 m) long and 55 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 128 over Oat Valley Creek built?
It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1987.
What condition is State Route 128 over Oat Valley Creek 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 State Route 128 over Oat Valley Creek carry?
About 2,550 vehicles per day (2013 count), of which roughly 8% are trucks.
How long is State Route 128 over Oat Valley Creek?
The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 55 ft wide.
Who owns State Route 128 over Oat Valley Creek?
It is owned by the State Highway Agency.