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:

ST 31 STATE RD

Over: WATER WILLARD BROOK

AT ST 119 INTERSECTION, Middlesex, MA

Built 1908 Load: 95.3 t ADT: 4,671

ST113 PLEASANT ST

Over: WATER BEAVER BK EAST STR

.8 KM N RIVERSIDE ST, Middlesex, MA

Built 1855 Load: 95.8 t ADT: 17,123

HWY BROOK ST

Over: WATER NASHOBA BROOK

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

Built 1938 Load: 99.2 t ADT: 7,200

HWY RIVER ST

Over: WATER FORT POND BROOK

@ CORNER OF CARRIAGE ST, Middlesex, MA

Built 1937 Load: 99.9 t ADT: 800

ST 27 MAIN ST

Over: WATER FORT POND BROOK

1 MI. S. OF SCHOOL ST, Middlesex, MA

Built 1900 Load: 99.9 t ADT: 9,069

HWY RIVER ST

Over: WATER FORT POND BROOK

.6 MI. E. OF ST. 27, Middlesex, MA

Built 1981 Load: 99.9 t ADT: 3,500

HWY RIVER ST

Over: WATER MYSTIC RIVER

TOWN LINE MED ARL, Middlesex, MA

Built 1938 Load: 99.9 t ADT: 5,302

ST 60 MEDFORD ST

Over: WATER MYSTIC RIVER

TOWN LINE MED ARL, Middlesex, MA

Built 1936 Load: 99.9 t ADT: 24,310

HWY MDDLSEX TPK

Over: WATER SHAWSHEEN RIVER

.7 M SE OF BILLERICA, Middlesex, MA

Built 1975 Load: 99.9 t ADT: 18,000

ST129 SALEM RD

Over: WATER SHAWSHEEN RIVER

0.75 MI E SALEM & BALDWIN, Middlesex, MA

Built 1932 Load: 99.9 t ADT: 10,600

US 3

Over: WATER RIVER MEADOW BRK

0.25 MI S RT 3 & RT 110, Middlesex, MA

Built 1959 Load: 99.9 t ADT: 126,338

US 3

Over: WATER STONY BROOK

1 MI NW DRUM HILL, Middlesex, MA

Built 1959 Load: 99.9 t ADT: 100,800

HWY ELM ST

Over: WATER SUDBURY RIVER

1.2 KM NE RT 2 & RT 62, Middlesex, MA

Built 1874 Load: 99.9 t ADT: 13,100

ST 62 MAIN ST

Over: WATER POWER CANAL

2.4 KM SW RT 2, Middlesex, MA

Built 1885 Load: 99.9 t ADT: 14,400

HWY MONUMENT ST

Over: WATER CONCORD RIVER

2.9 KM N OF RT 2, Middlesex, MA

Built 1877 Load: 99.9 t ADT: 6,607

I 90

Over: WATER SUDBURY RIVER

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

Built 1957 Load: 99.9 t ADT: 102,416

ST110 CHURCH

Over: WATER CONCORD RIVER

0.25 MI W RT 38, Middlesex, MA

Built 1858 Load: 99.9 t ADT: 13,000

HWY MILL ST

Over: WATER ASSABET RIVER

0.2 MI. N. OF RT. 62, Middlesex, MA

Built 1937 Load: 99.9 t ADT: 1,040

ST117 GREAT RD

Over: WATER MILL CANAL

INTER OF WINTER& RT117, Middlesex, MA

Built 1850 Load: 99.9 t ADT: 13,011

ST 9 BOYLSTON ST

Over: WATER CHARLES RIVER

NEWTON-WELLESLEY TWN LINE, Middlesex, MA

Built 1900 Load: 99.9 t ADT: 51,270

ST 9 BOYLSTON ST

Over: WATER HEMLOCK GORGE

AT QUINOBEQUIN RD, Middlesex, MA

Built 1932 Load: 99.9 t ADT: 56,450

I 90

Over: HWY CHARLES ST

.1 MI E.CHARLES RV S10, Middlesex, MA

Built 1964 Load: 99.9 t ADT: 86,719

HWY TOWNSEND RD

Over: WATER MULPUS BROOK

.1 MI N OF ST-2A, Middlesex, MA

Built 1961 Load: 99.9 t ADT: 2,050

HWY BRIDGE ST

Over: WATER SHAWSHEEN RIVER

1 MI NW OF WILMINGTON, Middlesex, MA

Built 1979 Load: 99.9 t ADT: 3,800

HWY CANAL ST

Over: WATER SQUANNACOOK RIVER

.1 MI. N. OF RT. 119, Middlesex, MA

Built 1850 Load: 99.9 t ADT: 4,350

ST119 RIVER RD

Over: WATER WILLARD BROOK

100 FT WEST OF WHEELER RD, Middlesex, MA

Built 1908 Load: 99.9 t ADT: 2,048

ST119 RIVER RD

Over: WATER WILLARD BROOK

0.25 MI E OF ASHBY T.L., Middlesex, MA

Built 1908 Load: 99.9 t ADT: 2,048

ST119 RIVER RD

Over: WATER WILLARD BROOK

AT STATE FOREST HEADQUTRS, Middlesex, MA

Built 1908 Load: 99.9 t ADT: 2,294

HWY NEWTON ST

Over: WATER CHARLES RIVER

0.35 MI SOUTH RTE 20, Middlesex, MA

Built 1877 Load: 99.9 t ADT: 16,601

HWY ASH ST

Over: WATER WESTON RESERVOIR

.9 MI N OF I 90, Middlesex, MA

Built 1902 Load: 99.9 t ADT: 1,810

I 90 RAMPS A & B

Over: OTHER MWRA AQUEDUCT

MTA NO. L-52 & S-8, Middlesex, MA

Built 1957 Load: 99.9 t ADT: 109,700

HWY TAYLOR ST

Over: I 495

0.25 MI S. ST. RTE 2, Middlesex, MA

Built 2015 Load: 1.1 t ADT: 3,000

HWY MAIN ST

Over: WATER SUDBURY RIVER

.1 MI S OF ST-9, Middlesex, MA

Built 1878 Load: 20.2 t ADT: 7,950

HWY MYST VAL PKY

Over: WATER ABERJONA RIVER

ADJACENT TO BMRR, Middlesex, MA

Built 1896 Load: 20.3 t ADT: 6,206

HWY TOWN FARM LN

Over: RR MBTA/BMRR

1 MI S RT 3A & WOBURN ST, Middlesex, MA

Built 1925 Load: 22.7 t ADT: 800

HWY FRANKLIN ST

Over: WATER SUDBURY RIVER

1000 FT N MT WAITE AV, Middlesex, MA

Built 1934 Load: 26.8 t ADT: 4,387

HWY BENNETTS CRS

Over: WATER BENNETTS BROOK

150' SOUTH OF ROUTE 2A, Middlesex, MA

Built 1991 Load: 32.4 t ADT: 200

HWY PINGRY WAY

Over: WATER BENNETTS BRK TRIB

850 FEET E OF BENNETTS CR, Middlesex, MA

Built 1991 Load: 32.4 t ADT: 200

HWY MIDDLESEX TP

Over: WATER VINE BROOK

150' S OF ST-62, Middlesex, MA

Built 1998 Load: 32.4 t ADT: 6,207

ST129 BILLERICA RD

Over: WATER RIVER MEADOW BROOK

1.6 KM W OF RTE 3, Middlesex, MA

Built 2022 Load: 32.4 t ADT: 14,535

HWY SHORE DRIVE

Over: WATER FREEMAN LAKE SPLWY

0.3 MI WEST OF GRACE ST, Middlesex, MA

Built 1975 Load: 32.4 t ADT: 300

HWY CAMBRDGE TPK

Over: WATER MILL BROOK

0.8 MI NW OF ST-2, Middlesex, MA

Built 2020 Load: 32.4 t ADT: 3,900

ST 9 WORCESTER RD

Over: WATER RESERVOIR OUTLET

.5 MI. WEST OF TEMPLE ST, Middlesex, MA

Built 2016 Load: 32.4 t ADT: 41,604

I 90 EB

Over: WATER MDC RES 3

MM 112/E OF EXIT 111/ST9, Middlesex, MA

Built 1957 Load: 32.4 t ADT: 52,197

HWY HILLSIDE DR

Over: WATER DEER BROOK

0.2 MI S OF MARSHALL ST, Middlesex, MA

Built 2000 Load: 32.4 t ADT: 400

HWY OLD SWMLL RD

Over: WATER DEER BROOK

RE, Middlesex, MA

Built 2000 Load: 32.4 t ADT: 400

HWY FRUIT ST

Over: COMB MBTA/CSX & SUDBURY

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

Built 2023 Load: 32.4 t ADT: 2,600

HWY WEDGEWOOD DR

Over: WATER BROOK

150 FT W OF SINGLETARY WY, Middlesex, MA

Built 2000 Load: 32.4 t ADT: 1,800

HWY CENTRAL ST

Over: WATER LWR PAWTUCKET CNL

SOUTH OF MARKET ST, Middlesex, MA

Built 1835 Load: 32.4 t ADT: 12,184

HWY MARKET ST

Over: WATER WESTERN CANAL

AT MICHALOPOULOS SQ, Middlesex, MA

Built 2019 Load: 32.4 t ADT: 6,900

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