Road 66B over Colusa Drain
FairPosted for loadGlenn County, California · 2 MI W of SH 45 · Structure no. 11C0068
- Built
- 1940
- 85 years old, rebuilt 1974
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 54 ft
- 3 main spans
- Daily traffic
- 64
- 2011 count
- Owner
- County
- County Highway Agency
About this bridge
Road 66B over Colusa Drain is a wood or timber stringer/multi-beam or girder carrying Road 66B over Colusa Drain in Glenn County, California. It was built in 1940 and reconstructed in 1974, so it is 85 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. Its operating status is: posted for load restriction.
It carries about 64 vehicles a day, projected to reach 90 by 2047. The structure is 54 ft (16.5 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
| 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 Road 66B over Colusa Drain built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1974.
What condition is Road 66B over Colusa Drain 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 February 2025.
How much traffic does Road 66B over Colusa Drain carry?
About 64 vehicles per day (2011 count).
How long is Road 66B over Colusa Drain?
The structure is 54 ft (16.5 m) long with a longest span of 18 ft (5.5 m) and a deck 20 ft wide.
Who owns Road 66B over Colusa Drain?
It is owned by the County Highway Agency.