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)

Sort:

HWY RESRVATN RD

Over: RR AMTRAK/MBTA

1.2 KM NE OF WOLCOTT SQ., Suffolk, MA

Built 1898 Load: 40.8 t ADT: 4,300

I 93 RAMP K

Over: COMB I93NB & RAMP MW

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

Built 2002 Load: 40.8 t ADT: 12,563

HWY TREMONT ST

Over: COMB AMTRAK/MBTA & ORNG

2ND BR S OF RUGGLES ST, Suffolk, MA

Built 1981 Load: 40.9 t ADT: 22,250

HWY W FOURTH ST

Over: COMB FNDRY ST&MBTA&AMTK

1.6 KM SE OF JCT I93&90, Suffolk, MA

Built 1893 Load: 41.0 t ADT: 21,630

I 93 RAMP XX

Over: HWY W FOURTH ST

0.1 K E. OF 193 NB, Suffolk, MA

Built 2002 Load: 41.0 t ADT: 6,041

I 93 RAMP XX

Over: HWY HOV EB

2.5 M E. OF 193 NB, Suffolk, MA

Built 2001 Load: 41.1 t ADT: 4,578

ST107 BROADWAY

Over: WATER MILL CREEK

IN CHELSEA, Suffolk, MA

Built 1993 Load: 41.2 t ADT: 19,977

HWY RAMP T-A/D

Over: I 90 & RAMP 1A-A/D

1.20 KM SE OF CALLAHAN TU, Suffolk, MA

Built 2001 Load: 41.4 t ADT: 14,400

HWY RAMP 1A-D

Over: HWY ARRIVAL ROADWAY

1.20 KM SE OF CALLAHAN T, Suffolk, MA

Built 2001 Load: 41.4 t ADT: 10,600

I 93 RAMP N-S

Over: OTHER RELIEF

LEVERETT CIR-UNIT 2, Suffolk, MA

Built 1999 Load: 41.4 t ADT: 34,304

I 93 NB

Over: OTHER RELIEF

0.0 M S I-90 WB B16702 U2, Suffolk, MA

Built 2002 Load: 41.5 t ADT: 77,653

I 93 /US1/ST3

Over: OTHER PED/ BIKE PATH

7.4 KM S OF JCT I90&I93, Suffolk, MA

Built 1956 Load: 41.6 t ADT: 172,489

US 1 CUTLER HWY

Over: WATER TOWN LINE BROOK

US-1 AT MM 53.6, Suffolk, MA

Built 1957 Load: 41.6 t ADT: 89,000

I 90

Over: WATER MUDDY RIVER

.2 MI FENWAY PARK S53, Suffolk, MA

Built 1965 Load: 41.7 t ADT: 128,567

I 93 NB

Over: COMB I90 RPS&HOV&AMTK

0.2 MI N I-90 EB, Suffolk, MA

Built 2002 Load: 41.7 t ADT: 116,800

HWY FOREST HILLS

Over: HWY CEMETERY RD

JUST N OF MORTON ST, Suffolk, MA

Built 1894 Load: 41.8 t ADT: 16,034

HWY MASS AV CONN

Over: OTHER RELIEF

MASS AVE. INT., Suffolk, MA

Built 2000 Load: 41.9 t ADT: 55,474

I 93 /US1/ST3

Over: RR CSX SPUR

2 MI S OF JCT I90&I93, Suffolk, MA

Built 1958 Load: 42.0 t ADT: 188,320

ST 1 A

Over: OTHER RELIEF

1.3 KM NE OF CALLAHAN TUN, Suffolk, MA

Built 1951 Load: 42.1 t ADT: 102,900

HWY MASS AVE

Over: OTHER RELIEF

MASS AVE. INT., Suffolk, MA

Built 2000 Load: 42.5 t ADT: 50,400

I 93 RAMP NS

Over: OTHER RELIEF

I93 RAMP NS, Suffolk, MA

Built 1999 Load: 42.6 t ADT: 31,810

I 93 RAMP SN

Over: OTHER RELIEF

I93 RAMP SN, Suffolk, MA

Built 1999 Load: 42.6 t ADT: 32,800

I 93 RAMP CC & FX

Over: COMB I90& RP KK &AMTRK

I93/I90 INTERCHANGE, Suffolk, MA

Built 2003 Load: 42.8 t ADT: 22,400

HWY SUMMER ST

Over: WATER FORT POINT CHANNEL

OVER FT POINT CHANNEL, Suffolk, MA

Built 1899 Load: 43.1 t ADT: 28,300

I 93 RAMP K

Over: OTHER RELIEF

I-93/I-90 INTERCHANGE, Suffolk, MA

Built 2004 Load: 43.1 t ADT: 8,793

HWY BROADWAY

Over: RR MBTA & SILVER LINE

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

Built 1917 Load: 43.1 t ADT: 13,060

HWY RAMP DB

Over: OTHER RELIEF

HAUL RD AND D ST INTRSECT, Suffolk, MA

Built 2005 Load: 43.2 t ADT: 8,800

HWY BEACON ST

Over: WATER MUDDY RIVER

.32 KM W OF JCT BEACON&2A, Suffolk, MA

Built 1900 Load: 43.4 t ADT: 7,500

I 90 EB

Over: US 20 N BEACON ST

.2 MI S. CHARLES RV S39, Suffolk, MA

Built 1964 Load: 43.4 t ADT: 44,057

I 93 RAMP LL

Over: COMB HOV EB & AMTRK&WYE

.5 MI S. OF I90 EB, Suffolk, MA

Built 2002 Load: 43.4 t ADT: 11,522

I 90 EB

Over: HWY PARSONS ST

.16 KM S. CHARLES RV S36, Suffolk, MA

Built 1964 Load: 43.5 t ADT: 44,057

I 90 WB

Over: HWY PARSONS ST

.16 KM S. CHARLES RV S36, Suffolk, MA

Built 1964 Load: 43.5 t ADT: 43,643

HWY SHAWMUT AVE

Over: COMB AMTRAK/MBTA

OVER ORANGE LINE, Suffolk, MA

Built 1932 Load: 43.5 t ADT: 8,700

HWY MERIDIAN ST

Over: ST 1 A/NB

AT EAST END OF CAL TNL, Suffolk, MA

Built 1961 Load: 43.7 t ADT: 20,689

I 93 STRRW DR CON

Over: WATER CHARLES RIVER

I93/US1 INTERCHANGE, Suffolk, MA

Built 1999 Load: 43.7 t ADT: 74,323

HWY BOYLSTON ST

Over: WATER MUDDY RIVER

.2 MI W OF MASS AVE, Suffolk, MA

Built 1881 Load: 43.8 t ADT: 51,600

US 1 RAMP TC

Over: RR MBTA

I93/US1 INTERCHANGE, Suffolk, MA

Built 2002 Load: 44.1 t ADT: 51,207

I 93 SB

Over: HWY W FOURTH ST

UNIT 1, Suffolk, MA

Built 2000 Load: 44.1 t ADT: 164,570

I 90 EB ON-RAMP

Over: COMB I90 W ONRP A & CSX

AT TOLL PLAZAS S104B, Suffolk, MA

Built 1965 Load: 44.2 t ADT: 12,400

HWY BELLEVUE ST

Over: RR MBTA

1.8 KM NE OF JCTSR109&RT1, Suffolk, MA

Built 1936 Load: 44.3 t ADT: 3,100

HWY MASS AVE

Over: ST 9 HUNTINGTON AVE

1.1 KM S OF CHARLES RIV, Suffolk, MA

Built 1941 Load: 44.5 t ADT: 33,100

I 93 /US1/ST3

Over: HWY MORRISSEY BLVD

4 MI S OF JCT I90&I93, Suffolk, MA

Built 1958 Load: 44.5 t ADT: 188,320

I 93 /US1/ST3

Over: HWY THEATRE ACCESS RD

4.5 MI S OF JCT I90&I93, Suffolk, MA

Built 1957 Load: 44.6 t ADT: 177,033

I 93 RAMP XXE

Over: HWY BROADWAY/EXT

0.1M E. OF I93 NB, Suffolk, MA

Built 2002 Load: 44.6 t ADT: 6,724

I 90 EB

Over: HWY BROOKS ST

.16 KM S. CHARLES RV S34, Suffolk, MA

Built 1964 Load: 45.0 t ADT: 55,255

I 90 WB

Over: HWY BROOKS ST

.16 KM S. CHARLES RV S34, Suffolk, MA

Built 1964 Load: 45.0 t ADT: 51,617

HWY BERKELEY ST

Over: COMB AMTRAK/MBTA & ORNG

1.7KM W. OF S., Suffolk, MA

Built 1982 Load: 45.0 t ADT: 19,900

US 1 RAMP TC

Over: I 93 RMPS SN NS ST

I93/US1 INTERCHANGE, Suffolk, MA

Built 2002 Load: 45.4 t ADT: 35,800

HWY S BOS BPS RD

Over: OTHER RELIEF

AT FRONTAGE RD NB, Suffolk, MA

Built 1998 Load: 45.4 t ADT: 13,190

HWY FRNT RD SB

Over: OTHER RELIEF

BYPASS RD INT., Suffolk, MA

Built 1997 Load: 45.8 t ADT: 42,155

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