Nj 31 over Stony Brook
GoodMercer County, New Jersey · 4.2 MI S of 31-202 JCT · Structure no. 1119156
- Built
- 1929
- 96 years old, rebuilt 2006
- Condition
- Good
- inspected May 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 38 ft
- 1 main span
- Daily traffic
- 16,541
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Nj 31 over Stony Brook is a prestressed concrete slab carrying Nj 31 over Stony Brook in Mercer County, New Jersey. It was built in 1929 and reconstructed in 2006, so it is 96 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 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 16,541 vehicles a day, roughly 7% of them trucks, projected to reach 19,850 by 2044. The structure is 38 ft (11.6 m) long and 74 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nj 31 over Stony Brook built?
It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2006.
What condition is Nj 31 over Stony Brook 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 2024.
How much traffic does Nj 31 over Stony Brook carry?
About 16,541 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is Nj 31 over Stony Brook?
The structure is 38 ft (11.6 m) long with a longest span of 34 ft (10.4 m) and a deck 74 ft wide.
Who owns Nj 31 over Stony Brook?
It is owned by the State Highway Agency.