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 2 WB

Over: ST 2 EB

RT 111 AT RT 2, Middlesex, MA

Built 1951 ADT: 33,550

HWY ARLINGTON ST

Over: ST 2 EB

1 MI NW RT 27, Middlesex, MA

Built 1950 ADT: 33,500

HWY HAYWARD RD

Over: ST 2 WB

0.25 MI NW RT 27, Middlesex, MA

Built 1950 ADT: 33,500

ST 27

Over: ST 2 WB

RT 27 AT RT 2, Middlesex, MA

Built 1952 ADT: 30,500

ST 60

Over: ST 2 EB

RT 60 AT RT 2, Middlesex, MA

Built 1967 ADT: 53,811

HWY OAK ST

Over: I 90 WB

.7MI.SO.RTE9, Middlesex, MA

Built 1957 ADT: 29,800

ST111

Over: I 495 SB

RT 111 AT RT 495, Middlesex, MA

Built 1963 ADT: 54,722

HWY WESTFORD ST

Over: I 495 SB

0.75 MI W RT 110, Middlesex, MA

Built 1961 ADT: 93,700

ST 4

Over: I 495 SB

RT 4 AT RT 495, Middlesex, MA

Built 1961 ADT: 22,050

HWY CARLISLE ST

Over: I 495 SB

1 MI E RT 3, Middlesex, MA

Built 1962 ADT: 83,050

ST 3 A GORHAM ST

Over: I 495 SB

1.25 MI W RT495/RT3, Middlesex, MA

Built 1962 ADT: 93,700

HWY HUNT RD

Over: I 495 SB

0.25 MI N RT 110 & HUNT, Middlesex, MA

Built 1961 ADT: 87,300

ST 99 SB

Over: ST 16 WB

AT RT 16, Middlesex, MA

Built 1956 ADT: 1,835

ST 99 NB

Over: ST 16 WB REV BCH PKWY

AT RT 16, Middlesex, MA

Built 1956 ADT: 18,350

ST126 CONCORD ST

Over: ST 9 WB

RT 126 AT RT 9, Middlesex, MA

Built 1931 ADT: 35,700

HWY MAIN ST

Over: ST 9 WB

0.75 MI W RT 9 & RT 126, Middlesex, MA

Built 1970 ADT: 36,000

I 90 RAMPS INT 12

Over: I 90 WB

W.WAYLAND TWN LINE, Middlesex, MA

Built 1957 ADT: 10,463

ST 9

Over: I 90 EB

AT MILE 111.5, Middlesex, MA

Built 1957 ADT: 40,600

I 90 RAMP OFF

Over: ST 9 WB

.1MI.W.RTE9, Middlesex, MA

Built 1957 ADT: 10,000

HWY TEMPLE ST

Over: I 90 WB

.1MI.S.PLEASANT ST, Middlesex, MA

Built 1957 ADT: 37,800

ST 30 PLEASANT ST

Over: I 90 EB

AT MILE 113.2, Middlesex, MA

Built 1957 ADT: 37,800

HWY GROVE ST

Over: I 90 WB

.2MI.E.PLEASANT ST, Middlesex, MA

Built 1957 ADT: 37,800

HWY OLD CONN PTH

Over: I 90 WB

AT MILE 116.3, Middlesex, MA

Built 1957 ADT: 37,500

I 495 SB

Over: I 90 EB

I-495 SB/ I-90, Middlesex, MA

Built 1965 ADT: 15,000

I 495 NB

Over: I 90 EB

I-495 NB/ I-90, Middlesex, MA

Built 1965 ADT: 15,000

HWY FRUIT ST

Over: I 495 SB

FRUIT ST/ I-495, Middlesex, MA

Built 1968 ADT: 15,000

I 90 RAMPS

Over: I 495 SB

I-90 RAMP ON CL/ I-495, Middlesex, MA

Built 1968 ADT: 15,000

I 90 WB RAMPS

Over: I 90 WB

.2MI.W.RTE495, Middlesex, MA

Built 1967 ADT: 16,576

HWY SPRING ST

Over: ST 2 WB

0.5 MI SE RT 128, Middlesex, MA

Built 1967 ADT: 38,650

HWY WATERTOWN ST

Over: ST 2 WB

0.75 MI E PLEASANT ST, Middlesex, MA

Built 1969 ADT: 38,500

HWY WHITCOMB AVE

Over: ST 2 WB

0.75 MI NW RT 495, Middlesex, MA

Built 1950 ADT: 37,300

HWY HARWOOD AVE

Over: I 495 SB

1 MI NE RT 2, Middlesex, MA

Built 1962 ADT: 87,300

ST110 KING ST

Over: I 495 SB

1.5 MI NE RT 495 & RT 2, Middlesex, MA

Built 1962 ADT: 21,764

HWY RUSSELL ST

Over: I 495 SB

0.5 MI NE RT 2A, Middlesex, MA

Built 1962 ADT: 87,300

ST119

Over: I 495 SB

RT 119 AT RT 495, Middlesex, MA

Built 1962 ADT: 21,764

HWY BOYLSTON ST

Over: I 495 SB

0.5 MI NE WOBURN ST, Middlesex, MA

Built 1961 ADT: 43,700

HWY FOREST ST

Over: I 495 NB

FOREST ST/I-495, Middlesex, MA

Built 1963 ADT: 27,000

US 20

Over: I 495 SB

US 20 EB/I-495, Middlesex, MA

Built 1962 ADT: 27,000

HWY ELM ST

Over: I 495 NB

000063 STATUTORY, Middlesex, MA

Built 1963 ADT: 43,700

HWY ELM ST

Over: I 495 SB

000063 STATUTORY, Middlesex, MA

Built 1963 ADT: 43,700

ST 27

Over: ST 9 EB

RT 27 AT RT 9, Middlesex, MA

Built 1931 ADT: 30,000

ST 9 EB RAMP OFF

Over: ST 9 WB

0.9 MI WEST RTS 27 & 9, Middlesex, MA

Built 1977 ADT: 30,000

HWY SPEEN ST SB

Over: ST 9 EB

000079 STATUTORY, Middlesex, MA

Built 1977 ADT: 35,000

HWY SPEEN ST SB

Over: ST 9 WB

000079 STATUTORY, Middlesex, MA

Built 1979 ADT: 35,000

ST 30 COMM RD

Over: I 90 EB

AT MILE 117.3, Middlesex, MA

Built 1957 ADT: 47,400

HWY ST JAMES ST

Over: I 90 EB

AT MILE 127.8, Middlesex, MA

Built 1964 ADT: 51,200

HWY WSHNGTN ST

Over: I 90 EB

000064 STATUTORY, Middlesex, MA

Built 1964 ADT: 51,900

ST 16 EB

Over: I 90 EB

AT MILE 125.3, Middlesex, MA

Built 1964 ADT: 50,400

HWY CENTRE AVE

Over: I 90 WB

000064 STATUTORY, Middlesex, MA

Built 1964 ADT: 48,900

HWY CHURCH ST

Over: I 90 WB

000064 STATUTORY, Middlesex, MA

Built 1966 ADT: 48,900

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 5, 2026