Total bridges
563
Public highway bridges in Middlesex County
County profile · official public datasets
Middlesex County, NJ
563 public highway bridges tracked in the FHWA National Bridge Inventory: 23.4% rated Good, 72.1% Fair, 4.4% Poor.
- 563
- Public bridges
- 23.4%
- Good condition
- 4.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Middlesex County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 33%
- lowest Poor share in state
- 4.4%
- Poor-condition share
- 563
- public highway bridges
- 1972
- 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.
Middlesex County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Middlesex County ranks #7 of 21 New Jersey counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.4%). Middlesex County, New Jersey contains 563 public highway bridges. Roughly 23.4% are rated “Good,” 72.1% “Fair,” and 4.4% “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.
Good condition
23.4%
132 of 563 rated 7-9
Fair condition
72.1%
406 of 563 rated 5-6
Poor condition
4.4%
25 of 563 rated 4 or below
In-state Poor-share rank
#7 of 21
Among New Jersey counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 563 NBI-tracked bridges by lowest applicable component rating.
Good 23.4% (132)
Fair 72.1% (406)
Poor 4.4% (25)
Middlesex County's Poor-condition bridges carry 402,662 vehicle crossings a day
That is 2.1% of the county's reported daily bridge traffic on 4.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 16,106 crossings a day against 29,014 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 563 of 563 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
58.6% of Middlesex County's bridges have passed the 50-year mark
330 of the 563 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 23.4% 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 16.8% of the county's Poor-condition bridge traffic
US 1 over FORRESTAL ROAD, built 1932, carries 67,565 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 25-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 402,662 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Middlesex County's bridges were built
563 bridges with a recorded construction year, grouped by decade
- pre-1900 4
Built before 1900
4 bridges
- 1900s 3
1900–1909
3 bridges
- 1910s 6
1910–1919
6 bridges
- 1920s 21
1920–1929
21 bridges
- 1930s 26
1930–1939
26 bridges
- 1940s 28
1940–1949
28 bridges
- 1950s
1950–1959
67 bridges
- 1960s
1960–1969
65 bridges
- 1970s
1970–1979
125 bridges
- 1980s 44
1980–1989
44 bridges
- 1990s
1990–1999
92 bridges
- 2000s 48
2000–2009
48 bridges
- 2010s 34
2010–2019
34 bridges
What this shows Construction peaked in the 1970s, when 125 of the county's bridges still in the inventory were built, which is 22.2% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1972, 6 years newer than the New Jersey average of 1966.
How Middlesex County compares with New Jersey's closest counties by inventory size
The 5 New Jersey counties nearest Middlesex County in number of bridges, with their condition splits. Its 4.4% Poor share is the 2nd-lowest of these 6. Its average build year of 1972 against a peer-group mean of 1967 is 5 years newer.
Showing the 5 closest of 20 New Jersey counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Bergen County | 577 | 19.1% | 76.1% | 4.9% | 1964 |
| Middlesex County (this page) | 563 | 23.4% | 72.1% | 4.4% | 1972 |
| Morris County | 508 | 19.7% | 74.4% | 5.9% | 1964 |
| Essex County | 505 | 16.2% | 81% | 2.8% | 1963 |
| Monmouth County | 505 | 32.9% | 58.2% | 8.9% | 1971 |
| Mercer County | 414 | 40.3% | 50.5% | 9.2% | 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 Middlesex 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 Middlesex County, both outside New Jersey so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside NJ (563 bridges here).
- Shawnee County, KS · 563 bridges
- Summit County, OH · 563 bridges
- Linn County, OR · 566 bridges
- Larimer County, CO · 559 bridges
Similar average build year
Nearest mean year-built outside NJ (1972 here).
- Santa Clara County, CA · avg 1972 · 964 bridges
- Madison County, AL · avg 1972 · 710 bridges
- Kern County, CA · avg 1972 · 668 bridges
- York County, PA · avg 1972 · 569 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (406)
SNO ROADWAY
FairOver: PORT READING RR & 94UTRN
0.9 MI N WOODBRIDGE SA, Middlesex, NJ
Built 1970 Load: 56.1 t ADT: 106,694
ROUTE 28
FairOver: BOUND BROOK
1.47M E.of CR622, Middlesex, NJ
Built 1961 Load: 56.2 t ADT: 24,235
RAMPGS(CR672TO18SB
FairOver: RAMPG(18SBTOCR672)
2.7 MILES NORTH OF US 1, Middlesex, NJ
Built 1982 Load: 56.2 t ADT: 3,046
NJ TPK NSO ROADWAY
FairOver: SAWMILL BROOK
1.4 MI SOUTH OF INT 9, Middlesex, NJ
Built 1990 Load: 57.3 t ADT: 41,983
INT 8A RAMP TNI
FairOver: NJ TPK SNO RWY
AT INT 8A, Middlesex, NJ
Built 1990 Load: 57.7 t ADT: 8,748
US 1 & 9
FairOver: NJ Transit and Inman Ave
1 MI S OF RAHWAY RIVER, Middlesex, NJ
Built 1985 Load: 59.9 t ADT: 72,277
ROUTE NJ 18 NB
FairOver: US 9 NB AND RAMP 8
RT 18 & US 9 INTERCHANGE, Middlesex, NJ
Built 1972 Load: 59.9 t ADT: 25,362
Industrial Avenue
FairOver: NJ 440 NB RAMP
0.6MI WEST OF GSP, Middlesex, NJ
Built 1970 Load: 59.9 t ADT: 4,277
PROBASCO ROAD
FairOver: MILLSTONE RIVER
0.7 MILE NORTH OF RTE 33, Middlesex, NJ
Built 2007 Load: 59.9 t ADT: 1,998
MAIN ST
FairOver: NJ TPK NSO-NSI SNI SNO
2.8 MI SOUTH OF INT 9, Middlesex, NJ
Built 1990 Load: 60.9 t ADT: 15,787
NJTPK SNO ROADWAY
FairOver: CONRAIL JAMESBURG BR
.4 MI N INTERCHANGE 8A, Middlesex, NJ
Built 1990 Load: 61.2 t ADT: 46,023
LANDING LANE CR609
FairOver: RARITAN RIVER
0.06 M North of CR 672, Middlesex, NJ
Built 1895 Load: 61.7 t ADT: 30,902
NJ TPK SNO ROADWAY
FairOver: SAWMILL BROOK
1.4 MI SOUTH OF INT 9, Middlesex, NJ
Built 1990 Load: 61.9 t ADT: 46,023
EXECUTIVE AVENUE
FairOver: MILL BROOK
0.62 miles E. of Mill Rd, Middlesex, NJ
Built 2012 Load: 62.6 t ADT: 1,922
AMBOY AVE & U-TURN
FairOver: NJ 440
0.27 MI EAST OF ROUTE 35, Middlesex, NJ
Built 1972 Load: 62.6 t ADT: 6,300
GSP
FairOver: US ROUTE 1
1.35 MI SOUTH OF NJ 27, Middlesex, NJ
Built 1948 Load: 63.2 t ADT: 218,849
CR 516(MATAWAN RD)
FairOver: NJ 18
3.01 Mi W. of US-9, Middlesex, NJ
Built 1960 Load: 63.5 t ADT: 27,917
BUCKELEW AVENUE
FairOver: MANALAPAN BROOK
FORSGATE & RR AVE JCT, Middlesex, NJ
Built 1993 Load: 63.5 t ADT: 8,458
STELTON RD(CR.529)
FairOver: I-287
0.53 MI S of I-287 Exit 6, Middlesex, NJ
Built 1962 Load: 65.3 t ADT: 29,297
NJ TP RAMP TSI
FairOver: NJ TPK(I-95) NSO RWY
0.20 MI SW OF I-95, Middlesex, NJ
Built 1973 Load: 65.4 t ADT: 11,195
WASHINGTON AVENUE
FairOver: NEW MARKET POND&CONRAIL
0.31 miles south of CR601, Middlesex, NJ
Built 1936 Load: 66.2 t ADT: 14,753
NJ TP RAMP SIT
FairOver: NJ TPK(I-95) SNO RWY
0.60 MI SW OF I-95, Middlesex, NJ
Built 1973 Load: 66.4 t ADT: 12,129
SHEPHERD AVENUE
FairOver: GREEN BROOK
0.5 MILE NORTH OF NJ 28, Middlesex, NJ
Built 1929 Load: 67.1 t ADT: 5,689
NJ 27 MIDDLESEX AV
FairOver: PORT READING SECONDARY
0.31 MILE NE OF GROVE ST, Middlesex, NJ
Built 2010 Load: 68.0 t ADT: 20,052
ROOSEVELT DR CR657
FairOver: TRIB S. BR. RAHWAY RIVER
0.2 MI S. OF PARSONAGE RD, Middlesex, NJ
Built 1995 Load: 68.0 t ADT: 6,776
NJ 18
FairOver: RARITAN R JOHNSON GEORGE
1.13MI W OF NJ18&27 JCT, Middlesex, NJ
Built 1980 Load: 68.0 t ADT: 45,869
SCUDDERS MILL RD
FairOver: AMTRAK
0.2 MI W/SCHALKS STN ROAD, Middlesex, NJ
Built 1983 Load: 68.0 t ADT: 23,051
ENGLISHTOWN RD 527
FairOver: MATCHAPONIX BROOK
0.71 MI S OF PENSION ROAD, Middlesex, NJ
Built 1994 Load: 68.0 t ADT: 10,667
WOODBRIDGE AVENUE
FairOver: US 1
1.35 MILES NORTH OF RT.18, Middlesex, NJ
Built 1962 Load: 68.9 t ADT: 12,280
MAIN ACCESS ROAD
FairOver: US 9
0.74 N. OF JCT 9 AND 34., Middlesex, NJ
Built 1991 Load: 68.9 t ADT: 3,334
18 SB
FairOver: US 9 SB
AT 18-9 INTERCHANGE, Middlesex, NJ
Built 1972 Load: 69.9 t ADT: 50,254
NJ 18 NORTHBOUND
FairOver: US 9 SOUTHBOUND
1.13 MI N OF RT 9/520 JCT, Middlesex, NJ
Built 1972 Load: 69.9 t ADT: 50,254
MAIN STREET
FairOver: BURTS CREEK
1.44 miles west of CR 535, Middlesex, NJ
Built 1978 Load: 71.7 t ADT: 12,550
NJ TPK MILE 77*
FairOver: NJ TPK NSO-NSI-SNI-SNO*
3.5 MI NORTH OF INT 8A, Middlesex, NJ
Built 1990 Load: 72.3 t ADT: 246
BORDENTOWN AVENUE
FairOver: SOUTH RIVER
0.06 miles north of CR677, Middlesex, NJ
Built 2008 Load: 73.5 t ADT: 11,210
NARICON PLACE
FairOver: NJ TPK INT.9 RAMP TW
.05 MI N INTERCHANGE 9, Middlesex, NJ
Built 1988 Load: 73.9 t ADT: 5,328
I-287 NB
FairOver: READING ROAD
2.5 MI NORTH OF US 1 JCT., Middlesex, NJ
Built 1962 Load: 75.3 t ADT: 71,857
FRESH PONDS ROAD
FairOver: IRELANDS BROOK
0.8 MILE WEST OF NJTPK, Middlesex, NJ
Built 1969 Load: 75.3 t ADT: 1,500
BORDENTOWN AV(615)
FairOver: DEEP RUN
0.57 miles north of CR677, Middlesex, NJ
Built 1987 Load: 78.0 t ADT: 11,210
RIVA AVENUE
FairOver: LAWRENCE BROOK
0.3 MILE EAST OF US 130, Middlesex, NJ
Built 1910 Load: 81.6 t ADT: 2,182
MAIN ST. (RT 514)
FairOver: WOODBRIDGE CTR DR.
0.5 MI WEST OF US 9 JCT, Middlesex, NJ
Built 2003 Load: 87.1 t ADT: 20,569
MAPLE AVENUE
FairOver: CRANBURY BROOK
0.3 MI S OF PLAINSBORO RD, Middlesex, NJ
Built 1999 Load: 89.8 t ADT: 5,421
GSP RAMPS C & D
FairOver: S BRANCH OF RAHWAY RIVER
JCT OF RMPS & STREAM, Middlesex, NJ
Built 1985 Load: 96.9 t ADT: 9,161
NJ 18 SB
FairOver: WESTONS MILL POND
0.30 MI S OF US 1, Middlesex, NJ
Built 1988 Load: 99.9 t ADT: 47,603
NJ 18 SERVICE
FairOver: Voorhees St
NJ 172 & NJ 18 JCT., Middlesex, NJ
Built 2009 Load: 99.9 t ADT: 20,127
MATAWAN-0. BR. RD
FairOver: LEFFERTS LAKE
0.33 miles west of CR 645, Middlesex, NJ
Built 1929 Load: 99.9 t ADT: 9,358
DAVIDSONS MILL RD.
FairOver: OAKLEYS BROOK
0.2 MILE EAST OF US 130, Middlesex, NJ
Built 2005 Load: 99.9 t ADT: 2,077
CRANBURY NECK ROAD
FairOver: MILLSTONE RIVER
0.1 MI W OF Groversmill, Middlesex, NJ
Built 1999 Load: 99.9 t ADT: 5,828
COUNTY ROUTE 522
FairOver: HEATHCOTE BROOK
0.90 MI. E. OF RT 1, Middlesex, NJ
Built 1996 Load: 99.9 t ADT: 12,114
NORTHUMBERLAND WAY
FairOver: TRIBUTARY OF LAWRENCE BR
.25 mi south of Major Rd, Middlesex, NJ
Built 1995 Load: 99.9 t ADT: 1,285
Read our methodology - how this data is sourced, computed, and verified.
Related
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.