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)

HWY SOUTH RD

Poor

Over: WATER ELM BROOK

.6 MI S OF RT 4 & 225, Middlesex, MA

Built 1970 Load: 6.5 t ADT: 3,400

ST 28 MCGRATH HWY

Poor

Over: COMB SOM AVE EXT & MBTA

.1 MI S OF MEDFORD ST, Middlesex, MA

Built 1958 Load: 12.0 t ADT: 18,436

HWY FIRST ST

Poor

Over: WATER BROAD CANAL

.16 KM N OF LONGFELLOW BR, Middlesex, MA

Built 1924 Load: 12.9 t ADT: 17,844

HWY WINTHROP ST

Poor

Over: WATER MYSTIC RIVER

1.1 KM W OF JCT I93&SR60, Middlesex, MA

Built 1926 Load: 17.2 t ADT: 14,900

ST 2

Poor

Over: HWY LAKE ST

0.5 MI E RT2 & RT60, Middlesex, MA

Built 1967 Load: 18.5 t ADT: 56,236

US 20 EB/WESTON ST

Poor

Over: I 95 /ST128

RT 20 EB AT RT 128, Middlesex, MA

Built 1960 Load: 19.1 t ADT: 29,250

ST 3 A/GORHAM ST

Poor

Over: WATER RIVER MEADOW BROOK

300 YDS SO LWLL CONNCTR, Middlesex, MA

Built 1960 Load: 21.1 t ADT: 13,600

I 95 ST128

Poor

Over: HWY QUINOBEQUIN RD

0.3 MI SLY RT 16, Middlesex, MA

Built 1950 Load: 22.4 t ADT: 142,579

HWY SUDBURY RD

Poor

Over: WATER ASSABET RIVER

0.8 MI. E. OF RT. 62, Middlesex, MA

Built 1902 Load: 23.1 t ADT: 4,400

ST 3 NB/MEMORL DR

Poor

Over: WATER CHARLES RIVER

JUST S OF LONGFELLOW BR, Middlesex, MA

Built 1956 Load: 23.5 t ADT: 17,000

I 93

Poor

Over: I 95 /ST128

RT 93 AT RT 128, Middlesex, MA

Built 1957 Load: 23.7 t ADT: 200,824

ST 2 A/MARRETT RD

Poor

Over: I 95 /ST128

RT 2A AT RT 128, Middlesex, MA

Built 1961 Load: 24.0 t ADT: 23,310

I 495 NB

Poor

Over: WATER ASSABET RIVER

MM 65.4, Middlesex, MA

Built 1963 Load: 24.1 t ADT: 55,989

HWY BRIDGE ST

Poor

Over: WATER EASTERN CANAL

0.4 KM S RTE 110 & 38, Middlesex, MA

Built 1937 Load: 24.8 t ADT: 25,862

ST119 MAIN ST

Poor

Over: WATER PEARL HILL BROOK

2.6 MI W OF ST-13, Middlesex, MA

Built 1907 Load: 24.9 t ADT: 8,358

ST 62 MAIN ST

Poor

Over: WATER ASSABET RIVER

0.25 MI SW RT 27 & MAIN, Middlesex, MA

Built 1922 Load: 25.6 t ADT: 8,000

I 95 SB/ST128 SB

Poor

Over: ST 3 A/CAMBRIDGE ST

AT JUNC. OF I 95 & ST 3A, Middlesex, MA

Built 1950 Load: 25.8 t ADT: 93,600

HWY SUFFOLK ST

Poor

Over: WATER NORTHERN CANAL

FRENCH ST EXT, Middlesex, MA

Built 1848 Load: 26.0 t ADT: 3,000

I 95 SB/ST128 SB

Poor

Over: HWY S BEDFORD ST

0.5 MI SW RT 95 & RT 3A, Middlesex, MA

Built 1950 Load: 26.5 t ADT: 92,706

HWY TRAPELO RD

Poor

Over: I 95 /ST128

1.4 KM SLY RT 2, Middlesex, MA

Built 1960 Load: 26.7 t ADT: 24,727

HWY MISHAWUM RD

Poor

Over: I 95 /ST128

1 MI NE RTE 38, Middlesex, MA

Built 1961 Load: 27.5 t ADT: 13,700

I 495 NB

Poor

Over: ST133 ANDOVER ST

RT 495 AT RT 133, Middlesex, MA

Built 1961 Load: 28.1 t ADT: 60,988

ST 9 BOYLSTON ST

Poor

Over: TR GREEN LINE D

2.3 KM ELY RT 128, Middlesex, MA

Built 1905 Load: 28.3 t ADT: 96,206

HWY FRUIT ST

Poor

Over: COMB MBTA/CSX & SUDBURY

.7 MI EAST OF I - 495, Middlesex, MA

Built 1936 Load: 28.8 t ADT: 4,238

ST117 MAIN ST

Poor

Over: I 95 /ST128

0.5 MI NLY RT 20, Middlesex, MA

Built 1962 Load: 28.8 t ADT: 18,600

HWY NB LOWLL CON

Poor

Over: I 495

1 MI E OF ST-110, Middlesex, MA

Built 1959 Load: 28.9 t ADT: 14,200

HWY SPEEN ST

Poor

Over: RR MBTA/CSX

0.1 MI NORTH OF RT 135, Middlesex, MA

Built 1900 Load: 29.5 t ADT: 13,000

ST 2 EB

Poor

Over: HWY PLEASANT ST

2.25 MI SE RT 2 & RT 128, Middlesex, MA

Built 1965 Load: 29.8 t ADT: 86,300

ST126 CONCORD RD

Poor

Over: RR MBTA/BMRR

1 MI N RT 117 & RT 126, Middlesex, MA

Built 1950 Load: 30.0 t ADT: 6,853

ST 2 WB

Poor

Over: HWY PLEASANT ST

2.25 MI SE RT 2 & RT 128, Middlesex, MA

Built 1965 Load: 30.5 t ADT: 76,500

HWY PARK AVE

Poor

Over: ST 2

1.6 KM NW RT 60, Middlesex, MA

Built 1967 Load: 31.3 t ADT: 19,500

I 495 SB

Poor

Over: WATER ASSABET RIVER

0.25 MI NW RT 290, Middlesex, MA

Built 1963 Load: 31.3 t ADT: 56,081

I 93 NB OFFRAMP

Poor

Over: ST 38 NB/MYSTIC AVE

3.2 KM N OF JCT I93&US1, Middlesex, MA

Built 1973 Load: 31.6 t ADT: 19,300

I 495 NB

Poor

Over: RR PAN AM

0.25 MI S OF ST-38, Middlesex, MA

Built 1961 Load: 32.2 t ADT: 64,233

I 90 RAMPS A & B

Poor

Over: WATER CHARLES RIVER

AT INT 14 L50, Middlesex, MA

Built 1957 Load: 32.2 t ADT: 80,100

I 495 NB

Poor

Over: ST110 CHELMSFORD ST

RT 495 AT RT 110, Middlesex, MA

Built 1960 Load: 32.5 t ADT: 55,955

HWY SB LOWLL CON

Poor

Over: I 495

1 MI E OF ST-110, Middlesex, MA

Built 1959 Load: 33.3 t ADT: 11,576

HWY LWLL CN B-10

Poor

Over: HWY LOWEL CON RAMP B8

RAMP B-10/RAMP B-8, Middlesex, MA

Built 1959 Load: 33.3 t ADT: 8,500

I 495 NB

Poor

Over: HWY TADMUCK RD

0.4 MI N OF RT 110, Middlesex, MA

Built 1961 Load: 33.7 t ADT: 97,289

ST119 /ST2 A

Poor

Over: WATER NASHOBA BROOK

0.25 MI S OF 27 & 2A, Middlesex, MA

Built 1940 Load: 33.9 t ADT: 12,463

I 495 NB

Poor

Over: HWY W MAIN ST

1.1 MI S OF ST-135, Middlesex, MA

Built 1966 Load: 33.9 t ADT: 48,152

I 95 /ST128

Poor

Over: RR MBTA/BMRR

1.6 KM W OF I-93 & I-95, Middlesex, MA

Built 1950 Load: 34.1 t ADT: 192,672

HWY LWL CON B-11

Poor

Over: I 495

0.4 KM E RT 495 & RT 3, Middlesex, MA

Built 1959 Load: 35.0 t ADT: 8,952

I 93

Poor

Over: ST 16 MYST VAL PKY

1 MI S OF JCT I93 & SR60, Middlesex, MA

Built 1960 Load: 35.6 t ADT: 182,420

I 495 NB

Poor

Over: HWY BOSTON RD

EXIT 83/N OF 110, Middlesex, MA

Built 1959 Load: 37.4 t ADT: 53,253

ST110 SB SMTH RTY

Poor

Over: HWY LOWELL-LWRNCE BLVD

WEST BRIDGE SMITH RTY, Middlesex, MA

Built 1954 Load: 40.6 t ADT: 5,690

ST113 MAIN ST

Poor

Over: WATER NASHUA RIVER

0.1 MI ELY CANAL ST, Middlesex, MA

Built 1937 Load: 43.1 t ADT: 12,017

US 3 NB

Poor

Over: I 95 /ST128 & CD

RT 3 AT RT 128, Middlesex, MA

Built 1962 Load: 45.7 t ADT: 22,600

I 90 WB RAMP OFF

Poor

Over: RR CSX/MBTA

AT INT 17 S32, Middlesex, MA

Built 1964 Load: 49.6 t ADT: 18,362

I 90 RAMP G

Poor

Over: OTHER MDC AQUEDUCT

AT INT 15 S4B, Middlesex, MA

Built 1962 Load: 51.9 t ADT: 36,206

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

Related

Browse all → | Rankings →
Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial