I-78 WB over Nj 173
FairHunterdon County, New Jersey · At I-78 Exit 15 · Structure no. 1016151
- Built
- 1958
- 67 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 73 ft
- 1 main span
- Daily traffic
- 44,645
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I-78 WB over Nj 173 is a prestressed concrete stringer/multi-beam or girder carrying I-78 WB over Nj 173 in Hunterdon County, New Jersey. It was built in 1958, so it is 67 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 44,645 vehicles a day, roughly 9% of them trucks, projected to reach 53,574 by 2044. The structure is 73 ft (22.3 m) long and 57 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-78 WB over Nj 173 built?
It was built in 1958, making it 67 years old in 2025.
What condition is I-78 WB over Nj 173 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 April 2024.
How much traffic does I-78 WB over Nj 173 carry?
About 44,645 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is I-78 WB over Nj 173?
The structure is 73 ft (22.3 m) long with a longest span of 68 ft (20.7 m) and a deck 57 ft wide.
Who owns I-78 WB over Nj 173?
It is owned by the State Highway Agency.