State Route 299 over Grass Valley Creek
FairTrinity County, California · 02-TRI-299-65.80 · Structure no. 05 0010
- Built
- 1962
- 63 years old, rebuilt 1997
- Condition
- Fair
- inspected March 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 569 ft
- 7 main spans
- Daily traffic
- 3,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 299 over Grass Valley Creek is a concrete continuous box beam or girders - multiple carrying State Route 299 over Grass Valley Creek in Trinity County, California. It was built in 1962 and reconstructed in 1997, 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 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 3,500 vehicles a day, roughly 23% of them trucks, projected to reach 4,565 by 2040. The structure is 569 ft (173.3 m) long and 35 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 299 over Grass Valley Creek built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1997.
What condition is State Route 299 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 March 2023.
How much traffic does State Route 299 over Grass Valley Creek carry?
About 3,500 vehicles per day (2009 count), of which roughly 23% are trucks.
How long is State Route 299 over Grass Valley Creek?
The structure is 569 ft (173.3 m) long with a longest span of 88 ft (26.8 m) and a deck 35 ft wide.
Who owns State Route 299 over Grass Valley Creek?
It is owned by the State Highway Agency.