Middlesex County, MA

820 public highway bridges

Middlesex County Bridge Snapshot

Middlesex County, Massachusetts contains 820 public highway bridges in the FHWA National Bridge Inventory. Roughly 20.4% are rated “Good,” 61.1% “Fair,” 8.8% “Poor,” and 8.8% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in MA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

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

820

Total Bridges

20.4%

Good

8.8%

Poor

8.8%

Structurally Deficient

Condition Distribution

Good

20.4% (167)

Fair

61.1% (501)

Poor

8.8% (72)

SD

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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026