County profile · official public datasets

Warren County, NJ

268 public highway bridges tracked in the FHWA National Bridge Inventory: 19.4% rated Good, 76.1% Fair, 4.5% Poor.

268
Public bridges
19.4%
Good condition
4.5%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Warren County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 38%
lowest Poor share in state
4.5%
Poor-condition share
268
public highway bridges
1952
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Warren County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Warren County ranks #8 of 21 New Jersey counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.5%). Warren County, New Jersey contains 268 public highway bridges. Roughly 19.4% are rated “Good,” 76.1% “Fair,” and 4.5% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

268

Public highway bridges in Warren County

Good condition

19.4%

52 of 268 rated 7-9

Fair condition

76.1%

204 of 268 rated 5-6

Poor condition

4.5%

12 of 268 rated 4 or below

In-state Poor-share rank

#8 of 21

Among New Jersey counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 268 NBI-tracked bridges by lowest applicable component rating.

Good
19.4% (52)
Fair
76.1% (204)
Poor
4.5% (12)

Warren County's Poor-condition bridges carry 95,788 vehicle crossings a day

That is 3.8% of the county's reported daily bridge traffic on 4.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 7,982 crossings a day against 7,017 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 268 of 268 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

70.9% of Warren County's bridges have passed the 50-year mark

190 of the 268 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 19.4% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 13.3% of the county's Poor-condition bridge traffic

NJ 31 over FURNACE BROOK, built 1926, carries 12,730 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 12-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 95,788 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Warren County's bridges were built

268 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 38 of the county's bridges still in the inventory were built, which is 14.2% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1952, 14 years older than the New Jersey average of 1966.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Warren County compares with New Jersey's closest counties by inventory size

The 5 New Jersey counties nearest Warren County in number of bridges, with their condition splits. Its 4.5% Poor share is the 4th-lowest of these 6. Its average build year of 1952 against a peer-group mean of 1970 is 18 years older.

Showing the 5 closest of 20 New Jersey counties eligible for comparison.

Bridge inventory size and condition shares for Warren County and the 5 New Jersey counties closest to it in inventory size
County Bridges Poor
Passaic County 333 3.3%
Warren County (this page) 268 4.5%
Camden County 261 6.5%
Gloucester County 243 2.5%
Ocean County 241 2.9%
Atlantic County 207 5.8%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Warren County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Warren County, both outside New Jersey so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside NJ (268 bridges here).

Similar average build year

Nearest mean year-built outside NJ (1952 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 268 Good 52 Fair 204 Poor 12

All bridges (268)

NJ 57

Good

Over: HANCES BROOK

0.5 MI EAST OF WATTERS RD, Warren, NJ

Built 1924 Load: 82.0 t ADT: 11,407

OLD TURNPIKE ROAD

Good

Over: MUSCONETCONG RIVER

110 FT E OF RT NJ 57 JCT, Warren, NJ

Built 1860 Load: 87.1 t ADT: 388

I-80 LINABERRY RMP

Good

Over: DELAWANNA CREEK

1.59 M EAST OF NJ 94, Warren, NJ

Built 1972 Load: 89.8 t ADT: 44,795

STRYKERS ROAD

Good

Over: LOPATCONG CREEK

0.22 MILES WEST OF RT 519, Warren, NJ

Built 2010 Load: 99.9 t ADT: 7,013

KINGS HIGHWAY

Good

Over: MUSCONETCONG RIVER

0.1 MI EAST OF NJ 57 JCT, Warren, NJ

Built 2006 Load: 99.9 t ADT: 1,010

BROOKFIELD DRIVE

Good

Over: POPHANDUSING CREEK

0.1 MI North of CR 519, Warren, NJ

Built 1999 Load: 99.9 t ADT: 602

RYMON ROAD

Poor

Over: MUSCONETCONG RIVER

0.1 MILE NO OF CR 645 JCT, Warren, NJ

Built 1868 Load: 0.0 t ADT: 410

S MAIN ST (CR 678)

Poor

Over: LOPATCONG CREEK

0.55 MI WEST OF CR 519, Warren, NJ

Built 1925 Load: 17.2 t ADT: 8,549

US 46

Poor

Over: PAULINS KILL

0.7 MI E OF I-80 & 94 JCT, Warren, NJ

Built 1933 Load: 18.1 t ADT: 9,530

NJ 57

Poor

Over: MILL BROOK

4.6 MI W OF RT 31 JCT, Warren, NJ

Built 1922 Load: 21.8 t ADT: 11,809

CO RTE 642 HIGH ST

Poor

Over: NORFOLK SOUTHERN RR

0.12 MI WEST OF CO RT 519, Warren, NJ

Built 1973 Load: 22.7 t ADT: 4,034

ROUTE US 46

Poor

Over: ABAND. HUDSON BR.CONRAIL

0.2 MI WEST OF CR 613, Warren, NJ

Built 1924 Load: 22.7 t ADT: 8,930

NJ 57

Poor

Over: LOPATCONG CREEK TRIBUTAR

0.39 MI EAST OF CR 519, Warren, NJ

Built 1921 Load: 23.6 t ADT: 10,951

NJ 57

Poor

Over: LOPATCONG CREEK

1.4 MI EAST OF RT 22, Warren, NJ

Built 1921 Load: 27.2 t ADT: 11,878

NJ 31

Poor

Over: FURNACE BROOK

2.1 MI SOUTH OF RT 46 JCT, Warren, NJ

Built 1926 Load: 28.1 t ADT: 12,730

VALLEY ROAD

Poor

Over: POHATCONG CREEK

2 MI. EAST CO RT 628 JCT, Warren, NJ

Built 1910 Load: 29.0 t ADT: 280

South Main Street

Poor

Over: Washington Scndry (N&S)

0.55MI SE PA611&US22 JCT, Warren, NJ

Built 1910 Load: 32.7 t ADT: 9,013

NJ 94

Poor

Over: JACKSONBURG CREEK

7.5 MI NORTH OF RTE I-80, Warren, NJ

Built 1931 Load: 39.0 t ADT: 7,674

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.