I-78 EB over Cowperthwaite Road
FairSomerset County, New Jersey · 2.3 MI West of I-287 · Structure no. 1816152
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 63 ft
- 1 main span
- Daily traffic
- 54,900
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I-78 EB over Cowperthwaite Road is a prestressed concrete stringer/multi-beam or girder carrying I-78 EB over Cowperthwaite Road in Somerset County, New Jersey. It was built in 1965, so it is 60 years old, older than the New Jersey average of 58.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 54,900 vehicles a day, roughly 14% of them trucks, projected to reach 65,900 by 2044. The structure is 63 ft (19.2 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-78 EB over Cowperthwaite Road built?
It was built in 1965, making it 60 years old in 2025.
What condition is I-78 EB over Cowperthwaite Road 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 August 2024.
How much traffic does I-78 EB over Cowperthwaite Road carry?
About 54,900 vehicles per day (2024 count), of which roughly 14% are trucks.
How long is I-78 EB over Cowperthwaite Road?
The structure is 63 ft (19.2 m) long with a longest span of 59 ft (18 m) and a deck 56 ft wide.
Who owns I-78 EB over Cowperthwaite Road?
It is owned by the State Highway Agency.