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 62 BURLINGTN RD

Over: WATER SHAWSHEEN RIVER

.8 MI W OF RTE 3, Middlesex, MA

Built 1962 Load: 47.6 t ADT: 17,100

ST 38 MAIN ST

Over: RR BMRR

0.4 MI SELY RT 495, Middlesex, MA

Built 1938 Load: 47.7 t ADT: 29,095

HWY SUDBURY ST

Over: WATER MILL CANAL

.2MI.SOUTH OF ST.62, Middlesex, MA

Built 1956 Load: 48.0 t ADT: 2,500

I 90 WB

Over: HWY INDIAN ROCK ROAD

I-90 MM 119.8, Middlesex, MA

Built 1957 Load: 48.0 t ADT: 65,074

HWY WALNUT ST

Over: RR MBTA/BMRR

1.1 KM SW JCT SR28&3, Middlesex, MA

Built 1902 Load: 48.1 t ADT: 3,900

HWY DANE ST

Over: RR MBTA/BMRR

3.2 KM N OF HARVARD BR., Middlesex, MA

Built 1913 Load: 48.1 t ADT: 10,900

HWY BRIDGE ST

Over: WATER STONY BROOK

1 MI S OF ST-40, Middlesex, MA

Built 1870 Load: 48.1 t ADT: 3,400

HWY HENDERSON ST

Over: WATER ALEWIFE BROOK

072288 128465599, Middlesex, MA

Built 1913 Load: 48.3 t ADT: 650

ST 62 MAIN ST

Over: WATER ASSABET RIVER

2.4 KM SW RT 2, Middlesex, MA

Built 1978 Load: 48.5 t ADT: 17,300

HWY PLSNT ST CON

Over: COMB ST 9 WB & CSX

1 MI W OF JCT 90 & 9, Middlesex, MA

Built 1994 Load: 48.5 t ADT: 11,137

HWY LAWSBROOK RD

Over: WATER FORT POND BROOK

100 FT SE OF SCHOOL ST, Middlesex, MA

Built 1928 Load: 48.7 t ADT: 2,885

I 95 ON RAMP

Over: OTHER MDC AQUEDUCT

.16 KM NORTH OF RT 30, Middlesex, MA

Built 1950 Load: 48.9 t ADT: 4,914

HWY WALNUT ST

Over: TR GREEN LINE D

OVER GREEN LINE, Middlesex, MA

Built 1906 Load: 49.0 t ADT: 24,569

I 93 RAMP TS

Over: US 1 RAMP LC

NORTH OF CHARLES RIVER, Middlesex, MA

Built 2002 Load: 49.6 t ADT: 15,468

I 495 SB

Over: US 3

RT 495 AT RT 3, Middlesex, MA

Built 2004 Load: 49.8 t ADT: 61,400

I 495 NB

Over: US 3

RT 495 AT RT 3, Middlesex, MA

Built 2004 Load: 49.8 t ADT: 118,965

HWY SOUTH ST

Over: WATER STONY BROOK

AT WESTON LINE, Middlesex, MA

Built 2003 Load: 49.8 t ADT: 16,293

HWY GREENVILLE R

Over: WATER MASON BROOK

.2 MI N OF MASON RD SPLIT, Middlesex, MA

Built 1950 Load: 50.0 t ADT: 4,350

HWY TOWN FARM RD

Over: WATER STONY BROOK

.4 MI. N. OF RT. 225, Middlesex, MA

Built 1949 Load: 50.0 t ADT: 2,825

HWY SCHOOL ST

Over: HWY PARKING LOT

0.40 KM S SCHOOL & BRDWAY, Middlesex, MA

Built 1995 Load: 50.3 t ADT: 17,845

I 95 NB/ST128 NB

Over: ST 38 WB/MAIN ST

RT 128 AT RT 38, Middlesex, MA

Built 1949 Load: 50.4 t ADT: 77,200

I 93 NB OFF RMP

Over: OTHER TRI COMMUNITY GREE

0.1 MI S MONTVALE AVE, Middlesex, MA

Built 1958 Load: 50.7 t ADT: 9,700

HWY ORCHARD RD

Over: US 3

1.5 MI SE CONCORD RIVER, Middlesex, MA

Built 2004 Load: 50.9 t ADT: 1,800

HWY LOWELL ST

Over: OTHER MINUTMN BP & BROOK

200 FT SO PARK AVE, Middlesex, MA

Built 1937 Load: 51.0 t ADT: 4,914

HWY ROGERS ST

Over: WATER CONCORD RIVER

.5 MI. W. OF RTE. 38, Middlesex, MA

Built 1884 Load: 51.2 t ADT: 15,600

HWY BROOKSIDE RD

Over: WATER STONY BROOK

1 MI W OF CHELMS LINE, Middlesex, MA

Built 1860 Load: 51.3 t ADT: 3,600

HWY SCHOOL ST

Over: WATER PAWTUCKET CANAL

0.40 KM S SCHOOL & BRDWAY, Middlesex, MA

Built 1995 Load: 51.6 t ADT: 17,457

US 3 SB

Over: HWY PARKHURST RD

0.4 KM S. DRUM HIL, Middlesex, MA

Built 2004 Load: 51.8 t ADT: 100,800

US 3 NB

Over: HWY PARKHURST RD

0.4 KM S. DRUM HIL, Middlesex, MA

Built 2004 Load: 51.8 t ADT: 100,800

ST 4 SB

Over: US 3 NB/SB

2.2 MI N OF I 495, Middlesex, MA

Built 2004 Load: 52.1 t ADT: 14,018

I 90

Over: WATER AQDCT AT SHAYLR LN

AT MM 122.3, Middlesex, MA

Built 1957 Load: 52.2 t ADT: 122,017

US 3 CD SB

Over: ST110 CHELMSFORD ST

0.8 KM N OF I 495, Middlesex, MA

Built 2004 Load: 52.4 t ADT: 27,673

ST 62 GLEASNDLE RD

Over: WATER ELIZABETH BROOK

300 FT SO OF BROOKSIDE AV, Middlesex, MA

Built 1967 Load: 52.5 t ADT: 7,500

ST113 KENDALL RD

Over: US 3

RT 113 AT RT 3, Middlesex, MA

Built 2004 Load: 52.5 t ADT: 13,448

ST 2

Over: WATER NASHOBA BROOK

0.8 KM NW RT 2 ROTARY, Middlesex, MA

Built 1951 Load: 53.0 t ADT: 47,823

US 1

Over: HWY LYNN ST

.6 N OF JCT SR 60 & US1, Middlesex, MA

Built 1937 Load: 53.0 t ADT: 81,880

I 290 RAMP H

Over: HWY 85 CONNECTOR

.2 MILES EAST OF 495, Middlesex, MA

Built 1978 Load: 53.0 t ADT: 29,749

I 90 WB RAMP ON

Over: RR CSX/MBTA

AT INT 17 S29, Middlesex, MA

Built 1964 Load: 53.2 t ADT: 19,009

HWY CENTRE ST

Over: TR GREEN LINE D

BETWEEN NORWOOD & PAUL ST, Middlesex, MA

Built 1907 Load: 53.8 t ADT: 13,600

HWY RANGEWAY RD

Over: US 3

1.25 MI NE RTE 4, Middlesex, MA

Built 2004 Load: 54.3 t ADT: 4,500

HWY BROADWAY

Over: WATER WESTERN CANAL

AT LEWIS & SUFFOLK STS., Middlesex, MA

Built 1833 Load: 54.5 t ADT: 6,600

ST129 BILLERICA RD

Over: US 3

RT 129 AT RT 3, Middlesex, MA

Built 2004 Load: 54.8 t ADT: 25,000

HWY WOBURN ST

Over: WATER IPSWICH RIVER

0.33MI S OF CONCORD ST, Middlesex, MA

Built 1980 Load: 54.8 t ADT: 6,000

US 3 SB

Over: HWY RICHARDSON RD

0.75 MI NW DRUM HILL, Middlesex, MA

Built 2004 Load: 54.9 t ADT: 50,638

ST 16 MYST VAL PKY

Over: WATER MYSTIC RIVER

.4 MI W OF WINTHROP ST, Middlesex, MA

Built 1906 Load: 54.9 t ADT: 33,900

I 90 WB RAMP OFF

Over: RR MBTA

AT INT 16 S15, Middlesex, MA

Built 1964 Load: 55.1 t ADT: 8,500

HWY GRANITEVILLE

Over: RR BMRR

50 FT S OF BROADWAY, Middlesex, MA

Built 1998 Load: 55.1 t ADT: 4,300

HWY MOUNTAIN AVE

Over: COMB MBTA/BMRR & ORANGE

BTWN SUMMER & WASHINGTON, Middlesex, MA

Built 1890 Load: 55.3 t ADT: 3,000

US 3 SB

Over: ST110 CHELMSFORD ST

0.8 KM N OF I 495, Middlesex, MA

Built 2004 Load: 56.3 t ADT: 42,155

US 3 NB

Over: ST110 CHELMSFORD ST

0.8 KM N OF I 495, Middlesex, MA

Built 2004 Load: 56.3 t ADT: 27,931

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