Diamond Hill Road over Green Brook
FairUnion County, New Jersey · At Somerset County Line · Structure no. 2001010
- Built
- 1925
- 100 years old, rebuilt 1997
- Condition
- Fair
- inspected March 2024
- Type
- Frame
- Concrete
- Length
- 43 ft
- 2 main spans
- Daily traffic
- 23,552
- 2024 count
- Owner
- County
- County Highway Agency
About this bridge
Diamond Hill Road over Green Brook is a concrete frame carrying Diamond Hill Road over Green Brook in Union County, New Jersey. It was built in 1925 and reconstructed in 1997, so it is 100 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 23,552 vehicles a day, roughly 4% of them trucks, projected to reach 28,738 by 2044. The structure is 43 ft (13.1 m) long and 43 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Diamond Hill Road over Green Brook built?
It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1997.
What condition is Diamond Hill Road over Green 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 March 2024.
How much traffic does Diamond Hill Road over Green Brook carry?
About 23,552 vehicles per day (2024 count), of which roughly 4% are trucks.
How long is Diamond Hill Road over Green Brook?
The structure is 43 ft (13.1 m) long with a longest span of 18 ft (5.5 m) and a deck 43 ft wide.
Who owns Diamond Hill Road over Green Brook?
It is owned by the County Highway Agency.