WB Route 4 Offramp over Somersville Road
GoodContra Costa County, California · 04-CC-004-26.01-ANT · Structure no. 28 0398K
- Built
- 2012
- 13 years old
- Condition
- Good
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 225 ft
- 2 main spans
- Daily traffic
- 20,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
WB Route 4 Offramp over Somersville Road is a prestressed concrete continuous box beam or girders - multiple carrying WB Route 4 Offramp over Somersville Road in Contra Costa County, California. It was built in 2012, so it is 13 years old, younger 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 20,000 vehicles a day, roughly 8% of them trucks, projected to reach 45,908 by 2045. The structure is 225 ft (68.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was WB Route 4 Offramp over Somersville Road built?
It was built in 2012, making it 13 years old in 2025.
What condition is WB Route 4 Offramp over Somersville Road 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 May 2023.
How much traffic does WB Route 4 Offramp over Somersville Road carry?
About 20,000 vehicles per day (2017 count), of which roughly 8% are trucks.
How long is WB Route 4 Offramp over Somersville Road?
The structure is 225 ft (68.5 m) long with a longest span of 118 ft (36.1 m) and a deck 27 ft wide.
Who owns WB Route 4 Offramp over Somersville Road?
It is owned by the State Highway Agency.