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 90 EB

Over: ST 27 N MAIN ST

117.9 MM RT. 90, Middlesex, MA

Built 1957 Load: 33.2 t ADT: 56,977

I 90 WB

Over: ST 27 N MAIN ST

I-90 MM 117.9, Middlesex, MA

Built 1957 Load: 33.2 t ADT: 84,899

HWY MARBLE ST

Over: I 93

0.88 KM SLY MONTVALE AVE, Middlesex, MA

Built 1958 Load: 33.2 t ADT: 25,335

I 90 EX 117 IN 13

Over: ST 30 COCHITUATE RD

OUTSIDE INT 13 L26, Middlesex, MA

Built 1957 Load: 33.4 t ADT: 52,165

US 20 EB

Over: RR MBTA/BMRR

O, Middlesex, MA

Built 1950 Load: 33.4 t ADT: 22,400

HWY PAWTUCKET ST

Over: RR BMRR

150 YDS SO OF RIVER, Middlesex, MA

Built 1976 Load: 33.5 t ADT: 20,560

HWY LOWELL CONN

Over: RR MBTA/BMRR

.8 KM W OF ST-3A, Middlesex, MA

Built 1960 Load: 33.5 t ADT: 55,846

HWY GROVE ST

Over: RR MBTA/BMRR

1.5 MI W OF JCT SR38&60, Middlesex, MA

Built 1891 Load: 33.5 t ADT: 1,100

I 90 RAMP D

Over: ST 30 SOUTH AV& I95 RMPS

AT INT 14 L45, Middlesex, MA

Built 1957 Load: 33.5 t ADT: 47,700

HWY SCHOOL ST

Over: WATER STONY BROOK

1.0 KM SE OF MAIN ST, Middlesex, MA

Built 1850 Load: 33.6 t ADT: 3,750

I 495 SB

Over: ST110 CHELMSFORD ST

RT 495 AT RT 110, Middlesex, MA

Built 1960 Load: 33.6 t ADT: 54,901

I 495 NB

Over: HWY RIVER RD

@MM 65.6, Middlesex, MA

Built 1963 Load: 33.6 t ADT: 47,733

I 495 SB

Over: HWY RIVER RD

@MM 65.6, Middlesex, MA

Built 1963 Load: 33.6 t ADT: 49,054

HWY STEADMAN ST

Over: US 3

0.75 MI E DRUM HILL, Middlesex, MA

Built 2004 Load: 33.7 t ADT: 8,911

HWY LOWELL CONN

Over: HWY THORNDIKE ST

.16 KM SE RT 3A & HALE ST, Middlesex, MA

Built 1960 Load: 33.7 t ADT: 35,900

HWY MEDFORD ST

Over: WATER MALDEN RIVER

.2 M E OF PEARL ST, Middlesex, MA

Built 1976 Load: 33.7 t ADT: 32,100

I 495 SB

Over: HWY TADMUCK RD

0.5 MI N OF BOSTON RD, Middlesex, MA

Built 1961 Load: 33.7 t ADT: 96,543

HWY GROVE ST

Over: I 95 /ST128

0.5 MI NE BEDFORD ST, Middlesex, MA

Built 1962 Load: 33.8 t ADT: 4,655

US 20 MAIN ST

Over: RR BMRR (ABANDONED)

.16 KM WLY WAVERLY ST, Middlesex, MA

Built 1954 Load: 33.9 t ADT: 22,400

I 495 SB

Over: OTHER BRUCE FREEMAN RAIL

0.5 MILE N. OF RTE 110, Middlesex, MA

Built 1959 Load: 34.0 t ADT: 113,100

HWY WASHNGTON AV

Over: RR MBTA/CSX

0.4 MI SW OF RT 27, Middlesex, MA

Built 1895 Load: 34.0 t ADT: 4,500

HWY MT VERNON ST

Over: WATER ABERJONA RIVER

BTW TWN HALL & FIRE STA., Middlesex, MA

Built 1890 Load: 34.0 t ADT: 10,600

I 495 NB

Over: HWY BERLIN RD

.5 MI. S. OF I-290, Middlesex, MA

Built 1963 Load: 34.1 t ADT: 49,423

I 495 SB

Over: HWY BERLIN RD

0.5 MI S. I-290, Middlesex, MA

Built 1963 Load: 34.1 t ADT: 47,192

I 495 SB

Over: HWY GOLDEN COVE RD

0.1 MI E RT 110, Middlesex, MA

Built 1960 Load: 34.2 t ADT: 88,200

HWY MISHAWUM RD

Over: RR MBTA/BMRR

1.6 KM W RT 93 & RT 128, Middlesex, MA

Built 1977 Load: 34.2 t ADT: 35,560

HWY HARTWELL AVE

Over: WATER KILN BROOK

1.1 KM SW OF RTE 225, Middlesex, MA

Built 1959 Load: 34.3 t ADT: 18,000

I 93 RP TO I93 NB

Over: I 93

1.0 KM NW JCT I93&SR28, Middlesex, MA

Built 1972 Load: 34.3 t ADT: 15,869

I 93

Over: HWY SHORE DR

.8 KM S OF JCT 193&SR16, Middlesex, MA

Built 1973 Load: 34.3 t ADT: 147,366

HWY STOW ST

Over: WATER FORT POND BROOK

.3MI. W. OF ST-27, Middlesex, MA

Built 1924 Load: 34.4 t ADT: 3,141

HWY POND ST

Over: RR MBTA/BMRR

1 MI NE SALEM & POND, Middlesex, MA

Built 1986 Load: 34.4 t ADT: 5,400

I 495 NB

Over: HWY GOLDEN COVE RD

0.1 MI E RT 110, Middlesex, MA

Built 1960 Load: 34.5 t ADT: 66,190

HWY FOREST AVE

Over: WATER ASSABET RIVER

.2 M SE OF RTE 62, Middlesex, MA

Built 1910 Load: 34.5 t ADT: 3,900

ST 16 MYST VAL PKY

Over: I 93

1.6 KM S OF JCT SR 60, Middlesex, MA

Built 1961 Load: 34.5 t ADT: 40,000

I 90 RAMPS

Over: COMB I 95 & CHARLES RIV

AT INT 14 L49, Middlesex, MA

Built 1957 Load: 34.5 t ADT: 56,670

HWY DUTTON ST

Over: WATER WESTERN CANAL

AT INT. PAWTUCKET CANAL, Middlesex, MA

Built 1986 Load: 34.6 t ADT: 33,940

ST110 /ST38

Over: WATER MERRIMACK RIVER

AT SAINTS MEMOIAL, Middlesex, MA

Built 1954 Load: 34.6 t ADT: 38,534

HWY FLORENCE ST

Over: HWY DARTMOUTH ST

1.3 KM S. MELROSE LINE, Middlesex, MA

Built 1975 Load: 34.6 t ADT: 10,700

I 90

Over: RR CSX

.3 MI. W. OF MDC RES, Middlesex, MA

Built 1957 Load: 34.7 t ADT: 114,872

I 90 EX 117 IN 13

Over: I 90

AT INTERCHANGE 13, Middlesex, MA

Built 1957 Load: 34.9 t ADT: 45,000

I 93

Over: HWY CONCORD ST

2.4 KM NLY RT 129, Middlesex, MA

Built 1958 Load: 34.9 t ADT: 155,000

I 495 NB

Over: ST 38 MAIN ST

RT 495 AT RT 38, Middlesex, MA

Built 1961 Load: 35.0 t ADT: 64,701

HWY LWLL CONN NB

Over: HWY RIVERNECK RD

0.4 KM W RT 495, Middlesex, MA

Built 1959 Load: 35.2 t ADT: 15,000

HWY HAMMOND ST

Over: TR GREEN LINE D

0.28 MI NOTH OF RTE 9, Middlesex, MA

Built 1893 Load: 35.2 t ADT: 9,681

I 495 NB

Over: ST135 WOOD ST

MM 55.3, Middlesex, MA

Built 1966 Load: 35.5 t ADT: 48,152

I 93 NB

Over: RR MBTA/BMRR

.6 KM NLY RT 129, Middlesex, MA

Built 1958 Load: 35.5 t ADT: 85,100

HWY MAIN ST

Over: WATER WEDGE POND OTLT

BTN. WEDGEPND & RR, Middlesex, MA

Built 1935 Load: 35.5 t ADT: 14,483

HWY CONCORD RD

Over: WATER NASHOBA BROOK

.1 MI W OF RTE 2A, Middlesex, MA

Built 1994 Load: 35.6 t ADT: 5,000

HWY TURNPIKE RD

Over: WATER TRAPFALL BROOK

.4 MI. EST. OF ST-31, Middlesex, MA

Built 1940 Load: 35.6 t ADT: 2,100

ST 2 CONCORD TPK

Over: RR MBTA/BMRR

2.6 KM SE OF RTE 62, Middlesex, MA

Built 1991 Load: 35.6 t ADT: 46,900

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