OAK TREE RD CR 604
Carrying OAK TREE RD CR 604 over LEHIGH VALLEY LINE
2.9MI N OF I287&NJ27 JCT, Middlesex, New Jersey
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: OAK TREE RD CR 604
The OAK TREE RD CR 604 bridge in Middlesex, New Jersey carries OAK TREE RD CR 604 over LEHIGH VALLEY LINE. It was built in 1931, making it 95 years old today. The structure is built primarily of steel and spans 1 section, stretching 51.2 meters (168 feet) end to end. Daily traffic averages 18,708 vehicles, placing it in the heavily-trafficked tier of New Jersey bridges. It is owned and maintained by Unknown.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 5/9, substructure at 5/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 24.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How OAK TREE RD CR 604 compares
Live comparison across New Jersey.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1931
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 51.2 m (168 ft)
- Deck Width
- 9.7 m (32 ft)
- Owner
- Unknown
- Avg Daily Traffic
- 18,708 vehicles/day
- Structure Number
- 1253164
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear flagged for priority repair.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
How to read this record
OAK TREE RD CR 604 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare OAK TREE RD CR 604 against other structures in Middlesex and across New Jersey. New Jersey bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for OAK TREE RD CR 604?
OAK TREE RD CR 604 in Middlesex, New Jersey has a deck rating of 4/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is OAK TREE RD CR 604 inspected?
OAK TREE RD CR 604's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 18,708 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. OAK TREE RD CR 604 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for OAK TREE RD CR 604?
OAK TREE RD CR 604 has an NBI inventory load rating of 24.5 metric tons.
Who is responsible for maintaining OAK TREE RD CR 604?
OAK TREE RD CR 604 is owned and maintained by Unknown.
How old is OAK TREE RD CR 604 and does age affect safety?
OAK TREE RD CR 604 was built in 1931, making it 95 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.