James Donlon Blvd over Contra Costa Canal
GoodContra Costa County, California · 1.5 MI E Somerville RD · Structure no. 28C0425
- Built
- 1950
- 75 years old, rebuilt 1978
- Condition
- Good
- inspected January 2025
- Type
- Tee Beam
- Concrete
- Length
- 36 ft
- 1 main span
- Daily traffic
- 1,873
- 2020 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
James Donlon Blvd over Contra Costa Canal is a concrete tee beam carrying James Donlon Blvd over Contra Costa Canal in Contra Costa County, California. It was built in 1950 and reconstructed in 1978, so it is 75 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 1,873 vehicles a day, roughly 2% of them trucks, projected to reach 2,224 by 2047. The structure is 36 ft (10.9 m) long and 94 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was James Donlon Blvd over Contra Costa Canal built?
It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1978.
What condition is James Donlon Blvd 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 January 2025.
How much traffic does James Donlon Blvd over Contra Costa Canal carry?
About 1,873 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is James Donlon Blvd over Contra Costa Canal?
The structure is 36 ft (10.9 m) long with a longest span of 34 ft (10.4 m) and a deck 94 ft wide.
Who owns James Donlon Blvd over Contra Costa Canal?
It is owned by the City or Municipal Highway Agency.