Suffolk County, MA

494 public highway bridges

Suffolk County Bridge Snapshot

Suffolk County, Massachusetts contains 494 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.7% are rated “Good,” 64.4% “Fair,” 6.9% “Poor,” and 6.9% 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.

494
Total Bridges
22.7%
Good
6.9%
Poor
6.9%
Structurally Deficient

Condition Distribution

Good
22.7% (112)
Fair
64.4% (318)
Poor
6.9% (34)
SD
6.9% (34)

All Bridges (494)

HWY SO STA CONN

Good

Over: I 93 RAMPS CC KK D

UNIT 1, Suffolk, MA

Built 2004 Load: 20.8 t ADT: 350

I 93 RMPS X XE

Good

Over: RR AMTRAK/MBTA

I93&I90 INT .4K SW P.O., Suffolk, MA

Built 2005 Load: 23.4 t ADT: 2,316

HWY SO STA CONN

Good

Over: HWY FRONTAGE RD

SOUTH STATION, Suffolk, MA

Built 1995 Load: 24.0 t

I 93 RAMP N-S

Good

Over: COMB NASHUA ST&MGH PKNG

LEVERETT CIRCLE, BOSTON, Suffolk, MA

Built 1999 Load: 25.5 t ADT: 34,304

HWY BEACH ST

Good

Over: TR BLUE LINE

AT INTERSECT KIMBALL AVE, Suffolk, MA

Built 1938 Load: 28.0 t ADT: 8,900

I 90 RAMP F

Good

Over: I 93 RMP KK &INFLD ACCS

.07K W OF I93NB@S.ST CON, Suffolk, MA

Built 2004 Load: 30.1 t ADT: 7,600

HWY DARTMOUTH ST

Good

Over: RR AMTRAK/MBTA

.16 KM S OF I90/COPLY PL., Suffolk, MA

Built 1983 Load: 32.4 t ADT: 27,310

HWY HARVARD ST

Good

Over: RR MBTA

.33 MI W OF SR28, Suffolk, MA

Built 1904 Load: 32.4 t ADT: 12,200

HWY FREIGHT COR

Good

Over: WATER RESERVE CHANNEL

MPA FREIGHT OFF SUMMER ST, Suffolk, MA

Built 2017 Load: 32.4 t ADT: 597

HWY S BOS BYPASS

Good

Over: COMB AMTRAK/MBTA&RED LN

.6 MI S OF JCT I 90, I 93, Suffolk, MA

Built 1995 Load: 32.4 t ADT: 10,776

ST145 REV BCH PKWY

Good

Over: RR MBTA/BMRR

.1 MI E OF ST 1A, Suffolk, MA

Built 1899 Load: 32.4 t ADT: 51,500

HWY RESERVATN RD

Good

Over: WATER MOTHER BROOK

.48 KM NW HYDE PARK AVE, Suffolk, MA

Built 1898 Load: 32.6 t ADT: 6,853

I 93 NB

Good

Over: OTHER RELIEF

ALBANY ST / FRONTAGE RD, Suffolk, MA

Built 2002 Load: 32.9 t ADT: 80,156

HWY N WSHNGTN ST

Good

Over: OTHER WAREHOUSE

NEAR BOSTON GARDEN, Suffolk, MA

Built 1900 Load: 33.0 t ADT: 36,206

I 93 RAMP AS

Good

Over: OTHER RELIEF

0.65 KM SOUTH OF I-90, Suffolk, MA

Built 2003 Load: 34.4 t ADT: 22,241

HWY SUMMER ST

Good

Over: HWY C ST

0.16 KM SW OF TWT, Suffolk, MA

Built 2000 Load: 34.4 t ADT: 20,043

HWY SUMMER ST

Good

Over: COMB I90 RPS& HAUL &CSX

AT CONVENTION CENTER, Suffolk, MA

Built 2002 Load: 34.5 t ADT: 22,241

HWY SO STA CONN

Good

Over: I 93 RAMPS CC KK D

UNIT 2, Suffolk, MA

Built 2004 Load: 35.1 t

HWY CHELSEA ST

Good

Over: WATER CHELSEA RIVER

AT CHELSEA RIVER, Suffolk, MA

Built 2012 Load: 35.2 t ADT: 13,400

I 93 RAMP SN

Good

Over: COMB MBTA & ORANGE LINE

I93 US1 INTERCHANGE, Suffolk, MA

Built 1999 Load: 35.7 t ADT: 11,575

HWY BELLNGHM ST

Good

Over: RR MBTA SILVER LINE

2.4 KM S OF JCT US1&SR16, Suffolk, MA

Built 1993 Load: 35.8 t ADT: 3,600

HWY CUMMINS HWY

Good

Over: RR AMTRAK/MBTA

JUST W OF HYDE PARK AVE, Suffolk, MA

Built 1921 Load: 36.1 t ADT: 6,500

HWY D ST

Good

Over: COMB HAUL RD & CSX

AT HAUL ROAD, Suffolk, MA

Built 2005 Load: 36.2 t ADT: 27,300

I 90 RAMP D

Good

Over: OTHER RELIEF

I 90 EXIT 22, Suffolk, MA

Built 1981 Load: 36.9 t ADT: 9,569

I 93 RAMP LC-N

Good

Over: I 93 RAMP S-N BOAT

UNIT 1, Suffolk, MA

Built 2003 Load: 37.5 t ADT: 12,400

HWY VIADUCT ST

Good

Over: COMB CNGRSS&HAUL RD&CSX

AT WORLD TRADE CENTER, Suffolk, MA

Built 2002 Load: 37.7 t ADT: 700

HWY DANA AVE

Good

Over: WATER NEPONSET RIVER

AT NEPONSET RIVER, Suffolk, MA

Built 1908 Load: 37.8 t ADT: 11,900

HWY SUMMER ST

Good

Over: HWY W SERVICE RD EXT

AT CONVENTION CENTER, Suffolk, MA

Built 2003 Load: 37.8 t ADT: 14,224

HWY RAMP L

Good

Over: HWY RAMP FL

MASS AVE. INT., Suffolk, MA

Built 2002 Load: 39.6 t ADT: 22,241

HWY SO STA CONN

Good

Over: COMB MBTA & RELIEF

SOUTH STATION, Suffolk, MA

Built 1995 Load: 39.9 t

US 1 RP ABUT-BT50

Good

Over: HWY ARLINGTON ST

1.3 KM NE OF TOBIN BR., Suffolk, MA

Built 1957 Load: 39.9 t ADT: 850

HWY RAMP K/L

Good

Over: OTHER RELIEF

MASS AVE. INT., Suffolk, MA

Built 2002 Load: 40.2 t ADT: 44,224

I 93 NB

Good

Over: I 93 SB/AUSTN ST/MBTA

I93/US1 INTERCHANGE, Suffolk, MA

Built 2002 Load: 40.4 t ADT: 36,462

HWY RAMP U-A

Good

Over: HWY RAMP S-A

1.20 KM SE OF CALLAHAN TU, Suffolk, MA

Built 2001 Load: 40.5 t ADT: 13,000

ST 1 A/RP E-1ASB

Good

Over: COMB ST 1A NB & BLUE L

SEGMENT 3, Suffolk, MA

Built 2002 Load: 40.5 t

HWY RAMP K

Good

Over: OTHER RELIEF

BOSTON, MASS AVE. INT., Suffolk, MA

Built 2002 Load: 40.5 t ADT: 45,000

HWY ALBANY EXT

Good

Over: I 90 RAMP H

.25 KM N OF I90, Suffolk, MA

Built 2005 Load: 40.5 t ADT: 11,250

I 93 RAMP FX

Good

Over: OTHER RELIEF

I93/I90 INTERCHANGE, Suffolk, MA

Built 2004 Load: 40.9 t ADT: 1,333

I 93 HOV RAMP EB

Good

Over: OTHER RELIEF

.16 KM S OF I-90 EB, Suffolk, MA

Built 2002 Load: 40.9 t ADT: 10,000

I 93 RAMP X

Good

Over: HWY BROADWAY

I93/I90 INTERCHANGE, Suffolk, MA

Built 2004 Load: 41.0 t ADT: 2,546

US 1 NB/S ABT PR1

Good

Over: HWY ARLINGTON & 5TH ST

.7 MI NE OF TOBIN BR., Suffolk, MA

Built 1957 Load: 41.0 t ADT: 41,988

I 90 EB & RP1ANB

Good

Over: HWY SR-14

SEGMENT 1, Suffolk, MA

Built 2003 Load: 41.1 t

HWY SO STA OB RP

Good

Over: OTHER RELIEF

SOUTH STATION, Suffolk, MA

Built 1995 Load: 41.1 t

ST 1 A/SB

Good

Over: OTHER RELIEF

SEGMENT 2, Suffolk, MA

Built 1999 Load: 41.2 t ADT: 15,000

ST 1 A/SB

Good

Over: OTHER RELIEF

SEGMENT 1, Suffolk, MA

Built 1999 Load: 41.2 t ADT: 15,000

US 1 RAMP S-TB

Good

Over: OTHER RELIEF

I 93 US RT 1 INTERCHANG, Suffolk, MA

Built 2001 Load: 41.2 t ADT: 15,409

I 90 WB & RP1ASB

Good

Over: COMB SR-14 & BLUE LINE

SEGMENT 1, Suffolk, MA

Built 2002 Load: 41.4 t

I 93 RAMP NS

Good

Over: US 1 RAMP TC

I93/US1 INTERCHANGE, Suffolk, MA

Built 1999 Load: 41.5 t ADT: 19,945

I 93 HOV RAMP EB

Good

Over: OTHER RELIEF

0.5 MI S. OF I-90, Suffolk, MA

Built 2002 Load: 41.6 t ADT: 1,453

HWY SO STA CONN

Good

Over: HWY INFIELD ACCESS

.5 KM E OF I93, Suffolk, MA

Built 2003 Load: 42.0 t ADT: 3,100

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