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)
NJTPK SNI ROADWAY
FairOver: WOODBRIDGE RIVER
2.4 MI E RTE 444 & NJTPK, Middlesex, NJ
Built 1950 Load: 33.4 t ADT: 55,445
PORT READING AVE.
FairOver: NJ TURNPIKE
0.4 MI N SA 10S & 10N, Middlesex, NJ
Built 1970 Load: 33.4 t ADT: 18,365
US 9 AND NJ 35
FairOver: RARITAN STREET
3.62 MI NORTH OF RT 34, Middlesex, NJ
Built 1937 Load: 33.6 t ADT: 105,945
ANDREJEWSKI DRIVE
FairOver: US 9
1.57 MI N OF 9-GSP JCT, Middlesex, NJ
Built 1941 Load: 33.6 t ADT: 2,983
US ROUTE 9
FairOver: METUCHEN AVENUE
0.52 Mi. N. of NJ TPK Jct, Middlesex, NJ
Built 1937 Load: 33.6 t ADT: 81,430
NJ 18 SB
FairOver: CONRAIL
2.12 MI S OF NJTPK JCT, Middlesex, NJ
Built 1963 Load: 33.6 t ADT: 33,313
NJ 35
FairOver: BORDENTOWN AVENUE
0.26 MI S OF 35-9 JCT, Middlesex, NJ
Built 1936 Load: 33.6 t ADT: 37,713
S.RANDOLPHVILLE RD
FairOver: AMBROSE BROOK
0.5 MI. N. OF METLARS LA, Middlesex, NJ
Built 1938 Load: 33.6 t ADT: 26,546
MAIN ST (CR 531)
FairOver: I-287
.15 MI NORTH OF US 1 JCT., Middlesex, NJ
Built 1962 Load: 33.6 t ADT: 16,424
NEWDURHAM RD(CR501
FairOver: I-287
1.33 MI SOUTH OF NJ 27, Middlesex, NJ
Built 1962 Load: 33.6 t ADT: 20,655
RYDERS LANE(CR617)
FairOver: WESTON MILL POND
0.5 MI. SOUTH OF US 1, Middlesex, NJ
Built 1990 Load: 33.6 t ADT: 14,784
EAST NEW ROAD
FairOver: AMTRAK NE CORRIDOR
1.6 MI. S OF US 1, Middlesex, NJ
Built 1951 Load: 33.6 t ADT: 2,570
RIVA AVENUE
FairOver: IRELAND BROOK
1.28 MILES E. OF RTE 130, Middlesex, NJ
Built 1987 Load: 33.6 t ADT: 2,182
NJTPK MI 75 U TURN
FairOver: NJ TPK NSO NSI SNI SNO*
1.6 MI NORTH OF INT 8A, Middlesex, NJ
Built 1989 Load: 33.7 t ADT: 251
NJTPK NSO ROADWAY
FairOver: NJ TPK INTER.11 RAMP TSO
0.25 MI W OF ROUTE 9, Middlesex, NJ
Built 1970 Load: 33.7 t ADT: 41,519
NJTPK SNO-SNI RWYS
FairOver: NJTPK U TURN
1.3 MI S INTER 10, Middlesex, NJ
Built 1974 Load: 34.0 t ADT: 117,943
NJTPK INT.11 R.TSO
FairOver: NJTPK NSI-SNI-SNO RDWY
0.20 MI W OF ROUTE 9, Middlesex, NJ
Built 1970 Load: 34.0 t ADT: 9,875
NJTPK(I-95)SNO RWY
FairOver: LAWRENCE BROOK
.1 MI N INTERCHANGE 9, Middlesex, NJ
Built 1973 Load: 34.3 t ADT: 56,697
US 9 NB and NJ 35
FairOver: US9 NB & Main St
0.09 MI South of CR 670, Middlesex, NJ
Built 1936 Load: 34.5 t ADT: 94,902
AMBOY AVE (CR 653)
FairOver: SPA SPRING CREEK
0.37 miles north of CR654, Middlesex, NJ
Built 1979 Load: 34.5 t ADT: 6,491
US 130
FairOver: DAVIDSON MILL POND
2.3 MI N OF RT 522 JCT, Middlesex, NJ
Built 1941 Load: 34.5 t ADT: 43,483
STELTON RD(CR 529)
FairOver: AMBROSE BROOK
1.1 MI S OF NEW DURHM RD, Middlesex, NJ
Built 1988 Load: 34.5 t ADT: 19,625
TALMADGE ROAD
FairOver: BOUND BROOK
0.5 MILE W OF CR531, Middlesex, NJ
Built 1993 Load: 34.5 t ADT: 19,216
MAIN ST (CR 531)
FairOver: P.AMBOY-S.PLAINFIELD BR.
0.6MI NW OF US1&I287 JCT, Middlesex, NJ
Built 1929 Load: 34.5 t ADT: 15,794
NJTPK NSO-NSI RWYS
FairOver: FORMER LEHIGH VALLEY RR
1.3 MI NORTH OF INT 9, Middlesex, NJ
Built 1951 Load: 34.7 t ADT: 117,944
GARDEN ST PKWY NBO
FairOver: RAMP C TO SERVICE AREA
2.1 MI S OF RARITAN TOLL, Middlesex, NJ
Built 1972 Load: 35.0 t ADT: 53,994
RIDGE ROAD (CR522)
FairOver: NJ TPK NSO NSI SNI SNO *
1.6 MI NORTH OF INT 8A, Middlesex, NJ
Built 1990 Load: 35.0 t ADT: 9,182
NJTPK INT 9 RP TNI
FairOver: NJTPK (I-95) SNO ROADWAY
.05 MI NORTH OF INT 9, Middlesex, NJ
Built 1973 Load: 35.0 t ADT: 17,517
DAVIDSONS MILL RD
FairOver: TURNPIKE MAINLINE
3.1 MI NORTH OF INT 8A, Middlesex, NJ
Built 1990 Load: 35.3 t ADT: 2,816
SNO & SNI RWYS
FairOver: MAIN ST EDISON
0.8 MI S OF INT. 10, Middlesex, NJ
Built 1974 Load: 35.3 t ADT: 117,943
US RT 9
FairOver: OLD BRDG MATAWAN RD(516)
2.28 MI NORTH OF RT 18, Middlesex, NJ
Built 1941 Load: 35.4 t ADT: 76,510
US 9
FairOver: BORDENTOWN AVE (CR 615)
2.15 MI NORTH OF RT 34, Middlesex, NJ
Built 1942 Load: 35.4 t ADT: 86,339
RIDGEDALE AVENUE
FairOver: WEDGEWOOD BROOK
1.4 MILES EAST OF RTE 1&9, Middlesex, NJ
Built 1979 Load: 35.4 t ADT: 966
HOW LANE (CR 680)
FairOver: AMTRAK NE CORRIDOR
0.18 MILES WEST OF NJ 26, Middlesex, NJ
Built 1950 Load: 35.4 t ADT: 23,304
PLAINSBORO RD.
FairOver: CEDAR BROOK
0.7 MI E OFGEORGE DAVIDSO, Middlesex, NJ
Built 1980 Load: 35.4 t ADT: 12,353
BLACK HORSE LANE
FairOver: OAKEYS BROOK
0.25 MI WEST OF US 130, Middlesex, NJ
Built 1940 Load: 35.4 t ADT: 281
GARDEN ST PKWY NBO
FairOver: ERNSTON ROAD
2.5 MI S OF RARITAN TOLL, Middlesex, NJ
Built 1954 Load: 35.6 t ADT: 57,881
NJ TPK RAMP WT-TE
FairOver: FORSGATE ROAD
AT INT 8A, Middlesex, NJ
Built 1990 Load: 35.6 t ADT: 41,736
NJ TURNPIKE(I-95)
FairOver: MILL BROOK
3.35 MI N OF EXIT 9, Middlesex, NJ
Built 1950 Load: 35.6 t ADT: 175,376
INMAN AVE (CR 602)
FairOver: GSP
2.23 MI NORTH OF NJ 27, Middlesex, NJ
Built 1948 Load: 36.0 t ADT: 18,463
NJTPK INT.11 R.KPN
FairOver: NJTPK INTER 11 RAMP PST
0.05 MI E OF GSP, Middlesex, NJ
Built 1970 Load: 36.0 t ADT: 5,731
NJTPK INT.12 R.SIT
FairOver: NJ TPK SNO RWY CRR OF NJ
INTERCHANGE 12, Middlesex, NJ
Built 1961 Load: 36.0 t ADT: 1,860
NJ 27
FairOver: RARITAN RIVER
Boat Lanch @ 2nd Av -Park, Middlesex, NJ
Built 1895 Load: 36.3 t ADT: 23,717
NEW MARKET RD- 665
FairOver: BOUND BROOK
.8 MI N OF N.BRUNSWICK RD, Middlesex, NJ
Built 1995 Load: 36.3 t ADT: 16,533
RAMP R
FairOver: CO.RT.656(SMITH ST) WB
BETWEEN GSP&US 9 BRIDGES, Middlesex, NJ
Built 1972 Load: 36.3 t ADT: 2,198
FLRD.GRV RD(CR655)
FairOver: NJ 440
0.81 MI EAST OF GSP, Middlesex, NJ
Built 1972 Load: 36.3 t ADT: 8,870
DUNHAMS CORNER RD.
FairOver: IRELAND BROOK TRIBUTARY
0.2 MILE EAST OF NJTPK, Middlesex, NJ
Built 1985 Load: 36.3 t ADT: 6,076
NJ TPK INT 11 TPS
FairOver: GARDEN STATE PARKWAY
0.20 MI SE OF NJ TPK, Middlesex, NJ
Built 1970 Load: 36.3 t ADT: 35,396
NJTPK INT.11 R.TSI
FairOver: NJTPK NSI-SNI-SNO RWYS
0.25 MI W OF ROUTE 9, Middlesex, NJ
Built 1970 Load: 36.3 t ADT: 17,342
GARDEN ST PKWY NBO
FairOver: RARITAN RVR.RLRD (ABAND)
0.6 MI S OF RARITAN TOLL, Middlesex, NJ
Built 1953 Load: 36.9 t ADT: 75,114
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.