Middlesex County, MA

820 public highway bridges

Middlesex County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Middlesex County, Massachusetts contains 820 public highway bridges. Roughly 20.4% are rated “Good,” 61.1% “Fair,” and 8.8% “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.

820

Total Bridges

20.4%

Good

61.1%

Fair

8.8%

Poor Condition

Condition Distribution

Good

20.4% (167)

Fair

61.1% (501)

Poor

8.8% (72)

All Bridges (820)

Sort:

I 495 SB

Over: HWY DONALD LYNCH BLVD

.1MI. N.W. OF I-290, Middlesex, MA

Built 1963 Load: 31.4 t ADT: 54,415

I 90 EB

Over: HWY WELLESLEY ST

2.5 MI W. ST 128&I 95 L39, Middlesex, MA

Built 1957 Load: 31.4 t ADT: 55,702

I 90 WB

Over: HWY WELLESLEY ST

SOUTH OF BROWN ST., Middlesex, MA

Built 1957 Load: 31.4 t ADT: 68,163

HWY MIDDLESEX ST

Over: COMB ARCH ST & BMRR

1.9 KM E OF CHELMSFORD, Middlesex, MA

Built 1959 Load: 31.5 t ADT: 25,200

HWY MASS AVE

Over: I 95 /ST128

.16 KM NORTH OF RT 2A, Middlesex, MA

Built 1961 Load: 31.6 t ADT: 8,793

I 95 /ST128

Over: WATER CHARLES RIVER

NEWTON WESTON TWN LINE, Middlesex, MA

Built 1961 Load: 31.6 t ADT: 171,190

ST 2 A/E MAIN ST

Over: RR MBTA / BMRR

0.1 MI E MAIN & PARK, Middlesex, MA

Built 1949 Load: 31.7 t ADT: 20,477

HWY LWLL CONN SB

Over: I 495 RAMP B-11

.16 KM S RT 495, Middlesex, MA

Built 1959 Load: 31.7 t ADT: 26,000

HWY LOWELL CONN

Over: HWY HOWARD ST

0.4 KM SW RT 3A, Middlesex, MA

Built 1960 Load: 31.7 t ADT: 55,800

ST 2

Over: HWY DOW AVE

0.75 MI W RT 2 & PARK AVE, Middlesex, MA

Built 1967 Load: 31.8 t ADT: 82,857

ST 2 A/MASS AVE

Over: RR MBTA/BMRR

.8 KM SE OF JCT SR2A&16, Middlesex, MA

Built 1899 Load: 32.0 t ADT: 14,094

HWY MILL ST

Over: RR MBTA/CSX

0.1 MI N OF RT 135, Middlesex, MA

Built 1900 Load: 32.1 t ADT: 7,800

HWY MYRTLE ST

Over: WATER SUDBURY RIVER

.5 MI N OF ST-135, Middlesex, MA

Built 1924 Load: 32.2 t ADT: 7,000

HWY LWLL CONN NB

Over: I 495 RAMP B-11

0.16 KM W RT 495, Middlesex, MA

Built 1959 Load: 32.2 t ADT: 15,000

HWY WALKER ST

Over: RR BMRR

0.40 KM SE WALKER & BRDWY, Middlesex, MA

Built 1910 Load: 32.2 t ADT: 4,028

HWY E MERRIMACK

Over: WATER CONCORD RIVER

AT CONCORD RIVER, Middlesex, MA

Built 1896 Load: 32.2 t ADT: 14,250

ST 30 SOUTH AVE

Over: I 95 /ST128

RT 30 AT RT 128, Middlesex, MA

Built 1962 Load: 32.2 t ADT: 32,600

US 20 WB

Over: RR MBTA/BMRR

0.1 MI WLY RT 128, Middlesex, MA

Built 1960 Load: 32.2 t ADT: 20,900

HWY SUDBURY RD

Over: WATER SUDBURY RIVER

.8 KM SW OF RTE 2, Middlesex, MA

Built 1967 Load: 32.3 t ADT: 13,000

I 93 ST38 SB RMP

Over: HWY CONNECTOR RAMP D&K

.16 KM S OF JCT SR28&ST38, Middlesex, MA

Built 1973 Load: 32.3 t ADT: 21,400

HWY MIDDLESEX ST

Over: WATER STONY BROOK

@ STONY BROOK, Middlesex, MA

Built 1850 Load: 32.4 t ADT: 2,208

I 495 SB

Over: WATER RIVER MEADOW BROOK

0.7 MI NO RT 110, Middlesex, MA

Built 1959 Load: 32.4 t ADT: 52,341

HWY OVERLOOK RD

Over: COMB SDDLE HLL TL & BRK

0.1 MI E OF GREENWOOD RD, Middlesex, MA

Built 2002 Load: 32.4 t ADT: 1,200

HWY WEDGEWOOD DR

Over: WATER BROOK

0.3 MI W OF CEDAR ST EXT, Middlesex, MA

Built 1990 Load: 32.4 t ADT: 1,200

I 93

Over: HWY WEBSTER ST

.5 MI S OF ROOSVELT CIR., Middlesex, MA

Built 1961 Load: 32.4 t ADT: 194,827

HWY BRIDGE ST

Over: WATER CHARLES RIVER

.96 KM E WALTHAM, Middlesex, MA

Built 1967 Load: 32.4 t ADT: 28,965

ST 28 MCGRATH

Over: HWY WASHINGTON ST

.1 MI W OF ALLSTON ST, Middlesex, MA

Built 1951 Load: 32.4 t ADT: 17,849

HWY WOODLAND DR

Over: WATER BAYBERRY HILL BRK

240' EAST OF ST 13, Middlesex, MA

Built 1970 Load: 32.4 t ADT: 220

HWY ELM ST

Over: WATER CHARLES RIVER

400 FT SO INT ELM & RIVER, Middlesex, MA

Built 1850 Load: 32.4 t ADT: 8,600

I 95 /ST128

Over: WATER STONY BROOK

0.96 KM SLY RT 20, Middlesex, MA

Built 1950 Load: 32.4 t ADT: 172,999

HWY MONTVALE AVE

Over: RR MBTA/BMRR

0.75 MI W OF I-93, Middlesex, MA

Built 1987 Load: 32.4 t ADT: 35,700

HWY LWLL CONN SB

Over: HWY RIVERNECK RD

0.4 KM S RT 495, Middlesex, MA

Built 1959 Load: 32.5 t ADT: 16,500

I 290 EB

Over: HWY BIGELOW ST

.1 MI W. OF I-495, Middlesex, MA

Built 1968 Load: 32.6 t ADT: 37,003

HWY COLLEGE AVE

Over: RR MBTA/BMRR

1.6 KM W JCT I93&SR16, Middlesex, MA

Built 1997 Load: 32.6 t ADT: 14,100

HWY DEPOT RD

Over: WATER STONY BROOK

AT JCT. OF LOWELL ST., Middlesex, MA

Built 1993 Load: 32.7 t ADT: 8,034

ST 62 PWDR MILL RD

Over: WATER ASSABET RIVER

.1 MI NW. OF CONCORD LINE, Middlesex, MA

Built 1953 Load: 32.8 t ADT: 10,623

I 495 NB

Over: OTHER BRUCE FREEMAN RAIL

.5 MILE N. OF RT 110, Middlesex, MA

Built 1959 Load: 32.8 t ADT: 113,100

I 93 NB

Over: ST 28 FELLSWAY WST

1KM S OF EXIT 34, Middlesex, MA

Built 1959 Load: 32.8 t ADT: 95,310

HWY FOUNTAIN ST

Over: WATER RESERVOIR 2

.4 MI W OF WINTER ST, Middlesex, MA

Built 1890 Load: 32.9 t ADT: 8,615

I 90 EB

Over: WATER SUDBURY RIVER

MM 114.9 OF I-90, Middlesex, MA

Built 1957 Load: 32.9 t ADT: 62,597

I 90 WB

Over: WATER SUDBURY RIVER

114.9 MM ON I-90, Middlesex, MA

Built 1957 Load: 32.9 t ADT: 57,526

I 90 EB

Over: ST126 CONCORD ST

MM 115.8, W OF EX 117, Middlesex, MA

Built 1957 Load: 32.9 t ADT: 52,197

I 90 WB

Over: ST126 CONCORD ST

MM 115.8, W OF EX 117, Middlesex, MA

Built 1957 Load: 32.9 t ADT: 52,861

HWY RSVELT ROT S

Over: I 93

1.1 KM N OF JCT SR60, Middlesex, MA

Built 1961 Load: 32.9 t ADT: 13,800

ST113 /ST3A/KENDLL

Over: WATER MERRIMACK RIVER

JUST EAST OF MIDDLESEX RD, Middlesex, MA

Built 1930 Load: 32.9 t ADT: 15,470

I 90 EX 117 IN 13

Over: OTHER COCHITUATE TRAIL

N. OF SPEEN ST, Middlesex, MA

Built 1957 Load: 33.0 t ADT: 23,755

ST225 GROTON RD

Over: WATER SQUANNACOOK RIVER

AT SHIRLY-GROTON T.L., Middlesex, MA

Built 1996 Load: 33.0 t ADT: 34,059

I 93 SB

Over: ST 28 FELLSWAY WST

RT 93 AT RT 28, Middlesex, MA

Built 1959 Load: 33.0 t ADT: 86,770

ST 16 MYST VAL PKY

Over: ST 38 MAIN ST

1 MI S OF JCT SR 60, Middlesex, MA

Built 1961 Load: 33.0 t ADT: 38,300

HWY CYPRESS ST

Over: TR GREEN LINE D

OVER GREEN LINE, Middlesex, MA

Built 1907 Load: 33.0 t ADT: 15,905

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

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

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Compiled by PlainBridges, Independent data publisher

Every figure on PlainBridge 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.