Gregory LN over Contra Costa Canal
GoodContra Costa County, California · 0.1 MI E Pleasant Hill RD · Structure no. 28C0347
- Built
- 1939
- 86 years old, rebuilt 1975
- Condition
- Good
- inspected February 2025
- Type
- Slab
- Concrete
- Length
- 23 ft
- 1 main span
- Daily traffic
- 9,000
- 2020 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Gregory LN over Contra Costa Canal is a concrete slab carrying Gregory LN over Contra Costa Canal in Contra Costa County, California. It was built in 1939 and reconstructed in 1975, so it is 86 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,000 vehicles a day, roughly 5% of them trucks, projected to reach 24,966 by 2047. The structure is 23 ft (7 m) long and 75 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| 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 Gregory LN over Contra Costa Canal built?
It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1975.
What condition is Gregory LN over Contra Costa Canal in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.
How much traffic does Gregory LN over Contra Costa Canal carry?
About 9,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Gregory LN over Contra Costa Canal?
The structure is 23 ft (7 m) long with a longest span of 22 ft (6.6 m) and a deck 75 ft wide.
Who owns Gregory LN over Contra Costa Canal?
It is owned by the City or Municipal Highway Agency.