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 3 A/BOSTON RD

Over: WATER CONCORD RIVER

1 MI N OF BILLERICA CTR, Middlesex, MA

Built 1920 Load: 56.8 t ADT: 19,655

ST 2 CONCORD TPK

Over: RR MBTA/BMRR

0.3 KM NW OF ROUTE 62, Middlesex, MA

Built 1988 Load: 57.0 t ADT: 46,900

HWY WATERFLD RD

Over: WATER ABERJONA RIVER

1.4 KM W MEDFORD, Middlesex, MA

Built 1915 Load: 57.1 t ADT: 9,800

US 3 CD NB

Over: ST110 CHELMSFORD ST

0.8 KM N OF I 495, Middlesex, MA

Built 2004 Load: 57.3 t ADT: 27,673

HWY SCHOOL ST

Over: RR MBTA/BMRR

1.3 KM SW OF JCT SR28&38, Middlesex, MA

Built 1898 Load: 57.3 t ADT: 2,100

HWY MONTVALE AVE

Over: WATER ABERJONA RIVER

0.2 MI W RTE 93, Middlesex, MA

Built 1958 Load: 57.3 t ADT: 39,100

HWY CROSS ST

Over: RR MBTA/BMRR

1.6 KM S JCT SR28&38, Middlesex, MA

Built 1928 Load: 57.4 t ADT: 8,500

HWY LOWELL ST

Over: RR BMRR SPUR

1.5 MI SW OF JCT SR28&38, Middlesex, MA

Built 1910 Load: 57.5 t ADT: 6,000

HWY TERR HALL AV

Over: WATER VINE BROOK

.15MI NE OF MIDDLESEX TPK, Middlesex, MA

Built 1956 Load: 57.6 t ADT: 9,271

HWY OLD BILLERIC

Over: US 3

1.0 MI NORTH OF ROUTE 62, Middlesex, MA

Built 2004 Load: 57.8 t ADT: 3,900

HWY LOCUST AVE

Over: US 3

1.1 MI S OF NH LINE, Middlesex, MA

Built 2004 Load: 58.1 t ADT: 3,491

US 3 SB

Over: ST 40 GROTON RD

RTE 3 AT RTE 40, Middlesex, MA

Built 2004 Load: 58.2 t ADT: 68,922

HWY NASHAWTUC RD

Over: WATER SUDBURY RIVER

.96 KM N OF RT 2 & 2A, Middlesex, MA

Built 1883 Load: 58.3 t ADT: 1,550

HWY RIVER ST

Over: WATER BEAVER BROOK

AT INT RIVER & NEWTON STS, Middlesex, MA

Built 1984 Load: 58.3 t ADT: 20,528

HWY CENTRAL ST

Over: WATER SUDBURY RIVER

JUST E OF EDGELL RD, Middlesex, MA

Built 1969 Load: 58.4 t ADT: 17,300

I 93 NB ON RAMP

Over: OTHER PEDESTRIAN

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

Built 1973 Load: 58.6 t ADT: 13,200

HWY LOWELL CONN

Over: WATER RIVER MEADOW BROOK

0.75 MI S PLAIN ST, Middlesex, MA

Built 1960 Load: 58.9 t ADT: 88,000

HWY LANGLEY RD

Over: TR GREEN LINE D

OVER GREEN LINE, Middlesex, MA

Built 1907 Load: 59.6 t ADT: 3,000

ST 16 MYST VAL PKY

Over: WATER MYSTIC RIVER

.2 MI E OF WINTHROP ST, Middlesex, MA

Built 1906 Load: 59.9 t ADT: 13,100

HWY CONCORD RD

Over: US 3

1.6 KM N RTE 4, Middlesex, MA

Built 2004 Load: 60.3 t ADT: 23,405

HWY TREBLE COVE

Over: US 3

1.2 MI. N. OF CONCORD RD., Middlesex, MA

Built 2004 Load: 60.3 t ADT: 12,400

HWY LWLL CONN SB

Over: US 3

0.6 MI S OF I 495, Middlesex, MA

Built 2004 Load: 60.4 t ADT: 9,800

HWY CHURCH ST

Over: OTHER CENTRAL RAIL TRAIL

.32 KM NELY CONANT RD, Middlesex, MA

Built 1911 Load: 60.6 t ADT: 7,758

HWY SCHOOL ST

Over: WATER MERRIMACK RIVER

S. OF VFW HIGHWAY, Middlesex, MA

Built 1917 Load: 60.9 t ADT: 20,800

US 3 SB

Over: HWY FARM RD

0.25 MI S TREBLECOVE RD, Middlesex, MA

Built 2004 Load: 61.0 t ADT: 59,224

US 3 NB

Over: HWY FARM RD

0.25 MI S TREBLECOVE RD, Middlesex, MA

Built 2004 Load: 61.0 t ADT: 53,663

HWY SYCAMORE ST

Over: RR MBTA/BMRR

1.3 KM W OF JCT SR28&38, Middlesex, MA

Built 1902 Load: 61.1 t ADT: 1,160

US 3 NB

Over: ST 40 GROTON RD

RTE 3 AT RTE 40, Middlesex, MA

Built 2004 Load: 61.2 t ADT: 51,585

HWY PLAIN ST

Over: WATER RIVER MEADOW BROOK

0.25 MI E RT 110, Middlesex, MA

Built 1960 Load: 63.6 t ADT: 12,850

HWY HERRICK RD

Over: TR GREEN LINE D

OVER GREEN LINE, Middlesex, MA

Built 1907 Load: 63.6 t ADT: 4,267

HWY PROSPECT ST

Over: WATER CHARLES RIVER

.6 MI. S. MAIN ST., Middlesex, MA

Built 1888 Load: 63.6 t ADT: 35,200

I 95 /ST128

Over: RR BMRR/MBTA

1.2 MI ELY RT 129, Middlesex, MA

Built 1948 Load: 63.7 t ADT: 127,837

HWY KEARNEY SQ

Over: WATER EASTERN CANAL

MERRIMACK & E.MERRIMACK, Middlesex, MA

Built 1835 Load: 64.8 t ADT: 15,000

HWY RECREATN RD

Over: ST128 SERVICE RD

0.8 KM SO MASS PIKE, Middlesex, MA

Built 1950 Load: 66.3 t ADT: 1,034

HWY PLEASANT ST

Over: WATER CHARLES RIVER

.1 MI SOUTH OF ST. 16, Middlesex, MA

Built 1861 Load: 67.5 t ADT: 9,000

HWY CONCORD RD

Over: OTHER CENTRAL RAIL TRAIL

0.6 KM NWLY BSTON POST RD, Middlesex, MA

Built 1911 Load: 67.7 t ADT: 5,431

HWY MYST VAL PKY

Over: WATER ALEWIFE BROOK

.4 MI N OF BROADWAY, Middlesex, MA

Built 1908 Load: 67.8 t ADT: 16,200

ST117 GREAT RD

Over: WATER ASSABET RIVER

0.4 MILES E STOW T. L., Middlesex, MA

Built 1900 Load: 67.8 t ADT: 12,464

ST113 PLEASANT ST

Over: WATER BEAVER BK WEST STR

.8 KM N RIVERSIDE ST, Middlesex, MA

Built 1855 Load: 68.3 t ADT: 17,123

HWY LAKEVIEW AVE

Over: WATER BEAVER BROOK

.40 KM E OF MAMMOTH RD, Middlesex, MA

Built 1850 Load: 71.9 t ADT: 9,250

HWY SUMMER ST

Over: WATER SHAWSHEEN RIVER

2.5 MI E OF SOUTH RD, Middlesex, MA

Built 1959 Load: 72.3 t ADT: 26,897

US 3 NB

Over: HWY MAIN ST

2 MI. NW DRUM HILL, Middlesex, MA

Built 2004 Load: 76.5 t ADT: 51,000

HWY DRAKE RD

Over: OTHER MINUTEMAN BIKE PTH

0.4 MI W OF PARK AVE, Middlesex, MA

Built 1995 Load: 77.6 t ADT: 400

ST 3 SB

Over: HWY LEDGE RD

1.1 MI N OF RTE 40, Middlesex, MA

Built 2004 Load: 77.9 t ADT: 40,287

ST 3 NB

Over: HWY LEDGE RD

1.1 M. NO. OF RT 40, Middlesex, MA

Built 2004 Load: 77.9 t ADT: 41,426

HWY WALNUT ST

Over: WATER ASSABET RIVER

.1 MI. S. OF ST-62, Middlesex, MA

Built 1922 Load: 78.2 t ADT: 2,500

HWY COMMRCIAL ST

Over: WATER LITTLE CREEK

.3 MI SOUTH OF MEDFORD ST, Middlesex, MA

Built 1960 Load: 81.7 t ADT: 24,000

HWY EAST ST

Over: WATER STRONG WATER BROOK

0.85MI E OF LIVINGSTON ST, Middlesex, MA

Built 2008 Load: 86.3 t ADT: 22,050

HWY LAWRENCE ST

Over: WATER RIVER MEADOW BROOK

NEAR CONCORD RIVER, Middlesex, MA

Built 1910 Load: 89.0 t ADT: 9,200

ST 38 MAIN ST

Over: WATER ABERJONA RIVER

.16 KM. E. OF RT. 38, Middlesex, MA

Built 1915 Load: 92.0 t ADT: 10,732

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