Lewiston Road over Grass Valley Creek
FairTrinity County, California · 1.4 MI North of SR 299 · Structure no. 05C0035
- Built
- 1965
- 60 years old, rebuilt 1987
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 34 ft
- 1 main span
- Daily traffic
- 330
- 2009 count
- Owner
- County
- County Highway Agency
About this bridge
Lewiston Road over Grass Valley Creek is a steel stringer/multi-beam or girder carrying Lewiston Road over Grass Valley Creek in Trinity County, California. It was built in 1965 and reconstructed in 1987, so it is 60 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 330 vehicles a day, roughly 2% of them trucks, projected to reach 470 by 2042. The structure is 34 ft (10.4 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Lewiston Road over Grass Valley Creek built?
It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1987.
What condition is Lewiston Road over Grass 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 August 2023.
How much traffic does Lewiston Road over Grass Valley Creek carry?
About 330 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Lewiston Road over Grass Valley Creek?
The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.7 m) and a deck 32 ft wide.
Who owns Lewiston Road over Grass Valley Creek?
It is owned by the County Highway Agency.