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
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
OAK TREE RD CR 604 in Middlesex, New Jersey sits above 12% of rated New Jersey bridges on inventory load rating (25 t), while its 1931 build year is earlier than 93% of Middlesex's recorded-year cohort (563 bridges).
OAK TREE RD CR 604 in Middlesex, New Jersey is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1931, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure NJ:1253164
PRE-1950 · STEEL · SINGLE-SPAN · DECK-LED · HEAVY-ADT · STANDARD-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- STEEL Steel
- SINGLE-SPAN Single span
- DECK-LED Deck-led
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
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.
How OAK TREE RD CR 604 compares
Age against the county: built in 1931, earlier than 525 of Middlesex's 563 bridges with a recorded construction year (93%), against a county median build year of 1972. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across New Jersey bridges with a recorded inventory load rating (6,826 of 6,827 rated).
OAK TREE RD CR 604 vs every rated New Jersey bridge
Inventory load rating (metric tons), FHWA NBI, this state
25 Top 88% higher than 12% of 6,826 bridges
rated New Jersey bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Middlesex inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 563 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
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
Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear on file for this vintage.
- • 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.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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.
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Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.