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:

HWY STONY BRK RD

Over: WATER STONY BROOK

.3 MI.N. OF LOWELL RD., Middlesex, MA

Built 1880 Load: 27.5 t ADT: 600

I 90

Over: RR CSX/MBTA

.1 MI S. CHARLES RV S40, Middlesex, MA

Built 1964 Load: 27.6 t ADT: 113,830

ST 2 WB

Over: HWY WALTHAM ST

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

Built 1965 Load: 27.8 t ADT: 47,200

ST 3 NB/MEMORL DR

Over: ST 3 SB TO LONGFLLW BRG

.1 MI S OF LONGFELLOW BR, Middlesex, MA

Built 1957 Load: 27.9 t ADT: 28,450

I 290 WB

Over: I 495

2 MILES NORTH OF ROUTE 20, Middlesex, MA

Built 1968 Load: 28.0 t ADT: 89,528

I 93

Over: HWY WEST ST

0.96 KM NLY RT 128, Middlesex, MA

Built 1959 Load: 28.0 t ADT: 164,350

ST 4 BEDFORD ST

Over: I 95 /ST128

AT EXIT 49 ON ST-128, Middlesex, MA

Built 1961 Load: 28.1 t ADT: 42,543

ST 28 FELLSWAY

Over: RR BMRR (ABANDONED)

AT RAILROAD, Middlesex, MA

Built 1850 Load: 28.2 t ADT: 28,190

I 495 SB

Over: WATER BEAVER BROOK

MM 79.5, Middlesex, MA

Built 1962 Load: 28.3 t ADT: 53,157

ST129 RICHMOND RD

Over: RR MBTA/BMRR

.32 KM W OF RTE 38, Middlesex, MA

Built 1973 Load: 28.3 t ADT: 29,500

I 495 NB

Over: WATER BEAVER BROOK

0.25 MI NE RT 2A, Middlesex, MA

Built 1962 Load: 28.4 t ADT: 60,125

HWY MT AUBURN ST

Over: OTHER GREENWAY M/U PATH

2 MI S OF JCT SR2, Middlesex, MA

Built 1955 Load: 28.5 t ADT: 35,200

HWY RIVER RD

Over: I 95 /ST128

2.3 KM SLY RT 20, Middlesex, MA

Built 1960 Load: 28.6 t ADT: 16,800

ST129 LOWELL ST

Over: RR MBTA/BMRR

0.1 MI ELY WILMINGTON T.L, Middlesex, MA

Built 1958 Load: 28.7 t ADT: 28,448

HWY HOSMER RD

Over: WATER WILLARD BROOK

150 FT SOUTH OF RTE 119, Middlesex, MA

Built 1935 Load: 29.1 t ADT: 200

HWY HOPKINS ST

Over: I 95 /ST128

0.3 MI NELY RT 28, Middlesex, MA

Built 1959 Load: 29.1 t ADT: 5,043

ST 62 MAIN ST

Over: WATER ASSABET RIVER

4.8 KM SW RT 2, Middlesex, MA

Built 1958 Load: 29.2 t ADT: 11,167

HWY MERRIMACK ST

Over: WATER MERRIMACK CANAL

AT DUTTON ST, Middlesex, MA

Built 1823 Load: 29.2 t ADT: 20,520

HWY MERRIMACK ST

Over: WATER WESTERN CANAL

AT SUFFOLK ST, Middlesex, MA

Built 1831 Load: 29.2 t ADT: 17,900

I 93 SB OFF RAMP

Over: I 93 CONNECTORS

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

Built 1973 Load: 29.2 t ADT: 13,300

I 93 NB

Over: HWY VALE ST

0.1 MI SLY ANDOVER T.L., Middlesex, MA

Built 1958 Load: 29.2 t ADT: 137,300

I 93 SB

Over: HWY VALE ST

0.1 MI SLY ANDOVER T.L., Middlesex, MA

Built 1958 Load: 29.2 t ADT: 137,300

I 95 SB/ST128 SB

Over: HWY FOREST PARK RD

1 MI NE RT 128 & RT 3A, Middlesex, MA

Built 1950 Load: 29.2 t ADT: 88,000

ST 99 SB/MAIN ST

Over: RR MBTA/BMRR/CSX

30 M S OF JCT SR16&SR99, Middlesex, MA

Built 1954 Load: 29.3 t ADT: 41,500

HWY SB LOWLL CON

Over: RR CSX (ABANDONED)

274 M E. INDUSTRIAL AVE., Middlesex, MA

Built 1960 Load: 29.7 t ADT: 23,224

I 290 WB

Over: HWY BIGELOW ST

MM31.8, 0.1 MI W OF I-495, Middlesex, MA

Built 1968 Load: 29.7 t ADT: 37,897

ST 16 RAMP

Over: RR MBTA/BMRR

.2 MI E OF SANTILLI CIR, Middlesex, MA

Built 1954 Load: 29.8 t ADT: 21,300

HWY NB LOWLL CON

Over: RR CSX (ABANDONED)

1000' N OF INDUSTRIAL AVE, Middlesex, MA

Built 1960 Load: 29.8 t ADT: 20,716

HWY FR MORIS BLV

Over: WATER WESTERN CANAL

.32 KM S. OF MERRIMACK R, Middlesex, MA

Built 1967 Load: 29.8 t ADT: 18,000

I 495 NB

Over: WATER RIVER MEADOW BROOK

0.7 MI N RTE 110, Middlesex, MA

Built 1959 Load: 30.0 t ADT: 66,190

HWY CONCORD ST

Over: WATER CHARLES RIVER

@ WESTON TL = W29007, Middlesex, MA

Built 1907 Load: 30.0 t ADT: 7,500

ST 28 MAIN ST

Over: WATER MARTINS BROOK

0.2 MI SLY RT 62, Middlesex, MA

Built 1903 Load: 30.0 t ADT: 31,080

ST 9 RAMP E

Over: ST 9 EB

.3 MILES WEST OF I-90, Middlesex, MA

Built 1989 Load: 30.1 t ADT: 2,700

I 95 /ST128

Over: HWY LINCOLN ST

0.5 MI N RT 2 & RT 95, Middlesex, MA

Built 1950 Load: 30.1 t ADT: 196,500

HWY PRESCOTT ST

Over: WATER NISSITISSIT RIVER

.6MI. N. OF BROOKLINE RD., Middlesex, MA

Built 1994 Load: 30.1 t ADT: 800

HWY LAWRENCE ST

Over: WATER CONCORD RIVER

JUST W OF CEMETERY, Middlesex, MA

Built 1850 Load: 30.3 t ADT: 9,600

I 95 /ST128

Over: HWY NORTH AVE

1.4 MI NELY RT 28, Middlesex, MA

Built 1950 Load: 30.4 t ADT: 134,371

I 93 SB

Over: RR MBTA/BMRR

0.4 MI NLY RT 129, Middlesex, MA

Built 1958 Load: 30.4 t ADT: 87,100

HWY RIVER ST

Over: WATER CONCORD RIVER

.8 M SE OF RTE 3, Middlesex, MA

Built 2003 Load: 30.5 t ADT: 12,900

I 95 /ST128

Over: ST 28 MAIN ST

RT 128 AT RT 28, Middlesex, MA

Built 1950 Load: 30.5 t ADT: 16,090

US 20 BSTN POST RD

Over: WATER HOP BROOK

AT CORNER OF STATION RD, Middlesex, MA

Built 1947 Load: 30.5 t ADT: 15,158

HWY BACON ST

Over: WATER ABERJONA RIVER

1.13 KM W OF MEDFORD, Middlesex, MA

Built 1920 Load: 30.5 t ADT: 15,776

HWY BARNUM RD

Over: WATER BOWERS BROOK

0.1MI S OF ST-110 ROTARY, Middlesex, MA

Built 1941 Load: 30.6 t ADT: 4,820

I 90 EB OFF RAMP

Over: OTHER MDC AQUEDUCT

ON MASS PIKE OFF RAMP, Middlesex, MA

Built 1961 Load: 30.7 t ADT: 31,700

HWY CONCORD ST

Over: WATER SUDBURY RIVER

.2 MI NORTH OF FRONT ST, Middlesex, MA

Built 1920 Load: 31.1 t ADT: 1,551

HWY LOWELL RD

Over: WATER CONCORD RIVER

2.0 MI N RTE 2, Middlesex, MA

Built 1964 Load: 31.1 t ADT: 12,000

HWY WINTHROP ST

Over: RR MBTA/BMRR

1.9 KM NW OF JCT I93&SR16, Middlesex, MA

Built 1984 Load: 31.3 t ADT: 20,172

HWY TRULL RD

Over: I 495

0.6 MI N RTE 38, Middlesex, MA

Built 1962 Load: 31.3 t ADT: 1,990

I 95 NB/ST128 NB

Over: ST 38 SB/MAIN ST

RT 128 AT RT 38, Middlesex, MA

Built 1949 Load: 31.3 t ADT: 85,675

I 95 SB/ST128 SB

Over: ST 38 SB/MAIN ST

RT 128 AT RT 38, Middlesex, MA

Built 1949 Load: 31.3 t ADT: 89,701

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