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.

pre-1900

13
1900s

18
1910s

25
1920s

29
1930s

29
1940s

11
1950s

22
1960s

11
1970s

38
1980s

21
1990s

24
2000s

19
2010s

6
2020s

2

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.

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	Good	Fair	Poor	Avg. built
Passaic County	333	22.2%	74.5%	3.3%	1963
Warren County (this page)	268	19.4%	76.1%	4.5%	1952
Camden County	261	20.7%	72.8%	6.5%	1963
Gloucester County	243	31.3%	66.3%	2.5%	1967
Ocean County	241	45.6%	51.5%	2.9%	1981
Atlantic County	207	36.2%	58%	5.8%	1975

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).

Polk County, MN · 268 bridges
Jackson County, MS · 268 bridges
Niagara County, NY · 268 bridges
Delaware County, OH · 268 bridges

Similar average build year

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

Mason County, TX · avg 1952 · 84 bridges
Roberts County, TX · avg 1952 · 22 bridges
Maricao County, PR · avg 1952 · 13 bridges
Kings County, NY · avg 1953 · 242 bridges

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)

Sort:

Warren County Bridge Snapshot

Condition distribution

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

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

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

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (268)

Northampton Street

BUTTZVILLE ROAD

STATION ROAD

Dirt Farm Road

BRUGLER ROAD

CR620S

LAMBERT ROAD

CR 627

SAND HILL ROAD

RICHLINE HILL ROAD

PEQ. HATCH. ACCESS

CR615 (LONG BR.RD)

STONY BROOK ROAD

LOCK STREET

COUNTY ROUTE 632

I-78 EASTBOUND

COUNTY ROUTE 620

MANSFIELD STREET

JACKSONBURG ROAD

MOHICAN ROAD

RAVINE ROAD

CREEK ROAD

CHESTNUT STREET

CR615 (LONG BR RD)

CR 655 (VAIL ROAD)

CR 659

I-78 EB

I-78 WB

US 22 WB

NJ 31

I-78 WESTBOUND

LOCK STREET

NJ 94 NB US 46 RMP

JACKSONBURG ROAD

MILLBROOK ROAD

COBBLEWOOD ROAD

COUNTY ROUTE 637

CR 650

COUNTY ROUTE 618

NJ 57

FOUL RIFT ROAD

WELSH SPUR ROAD

STONE BRIDGE ROAD

US 22 EB

COUNTY ROUTE 609

CR 622

CR 519

WEST QUARRY ROAD

CO RT 623

I-78 EB

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