Mountain Blvd over Stony Brook
FairSomerset County, New Jersey · At Rt 531 JCT · Structure no. 18L1009
- Built
- 1908
- 117 years old, rebuilt 1968
- Condition
- Fair
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 57 ft
- 2 main spans
- Daily traffic
- 13,979
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Mountain Blvd over Stony Brook is a prestressed concrete box beam or girders - multiple carrying Mountain Blvd over Stony Brook in Somerset County, New Jersey. It was built in 1908 and reconstructed in 1968, so it is 117 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 5 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 13,979 vehicles a day, roughly 4% of them trucks, projected to reach 17,058 by 2043. The structure is 57 ft (17.4 m) long and 54 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Mountain Blvd over Stony Brook built?
It was built in 1908, making it 117 years old in 2025. It was reconstructed in 1968.
What condition is Mountain Blvd over Stony Brook 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 October 2023.
How much traffic does Mountain Blvd over Stony Brook carry?
About 13,979 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Mountain Blvd over Stony Brook?
The structure is 57 ft (17.4 m) long with a longest span of 29 ft (8.8 m) and a deck 54 ft wide.
Who owns Mountain Blvd over Stony Brook?
It is owned by the County Highway Agency.