Gridley Colusa HWY over Main Drainage Canal
FairButte County, California · 3.7 MI E/O Colusa CO Line · Structure no. 12C0013
- Built
- 1934
- 91 years old, rebuilt 1949
- Condition
- Fair
- inspected March 2025
- Type
- Tee Beam
- Concrete Continuous
- Length
- 154 ft
- 9 main spans
- Daily traffic
- 715
- 2019 count
- Owner
- County
- County Highway Agency
About this bridge
Gridley Colusa HWY over Main Drainage Canal is a concrete continuous tee beam carrying Gridley Colusa HWY over Main Drainage Canal in Butte County, California. It was built in 1934 and reconstructed in 1949, so it is 91 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 715 vehicles a day, roughly 19% of them trucks, projected to reach 954 by 2047. The structure is 154 ft (46.9 m) long and 30 ft wide. If it were closed, the detour would be 44.7 mi (72 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Gridley Colusa HWY over Main Drainage Canal built?
It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1949.
What condition is Gridley Colusa HWY over Main Drainage Canal 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 2025.
How much traffic does Gridley Colusa HWY over Main Drainage Canal carry?
About 715 vehicles per day (2019 count), of which roughly 19% are trucks.
How long is Gridley Colusa HWY over Main Drainage Canal?
The structure is 154 ft (46.9 m) long with a longest span of 17 ft (5.2 m) and a deck 30 ft wide.
Who owns Gridley Colusa HWY over Main Drainage Canal?
It is owned by the County Highway Agency.