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:

I 93 SB BT 46-57

Over: TR ORANGE LINE

.5 MI N OF JCT I93&US1, Suffolk, MA

Built 1970 Load: 32.7 t ADT: 87,100

I 93 NB B16-NB4

Over: I 93 SB&CMBRG&MBTA/BMRR

1.1 MI N OF JCT I93&US1, Suffolk, MA

Built 1970 Load: 32.8 t ADT: 76,000

ST 2 BROOKLINE ST

Over: COMB SOL FLD RD & RIV

CITY LINE BOS CAMB, Suffolk, MA

Built 1928 Load: 33.0 t ADT: 37,370

I 93 NB

Over: I 93 SB BT 46 - 57

.5 MI N OF JCT I93&US1, Suffolk, MA

Built 1970 Load: 33.0 t ADT: 72,888

I 93 SB BT 61-B5

Over: RR BMRR

0.24 MI S OF CAMBRIDGE ST, Suffolk, MA

Built 1970 Load: 33.0 t ADT: 87,100

HWY FAIRMONT AVE

Over: COMB WALNUT ST & MBTA

1 MI W OF SR138/NEP PKW., Suffolk, MA

Built 1908 Load: 33.3 t ADT: 18,103

HWY COMM AVE WB

Over: WATER MUDDY RIVER

.3 MI E OF KENMORE SQ., Suffolk, MA

Built 1917 Load: 33.3 t ADT: 9,800

I 93 SB B16-SB4

Over: COMB CAMBRIGE&MBTA/BMRR

1.2 MI N OF JCT I93&US1, Suffolk, MA

Built 1970 Load: 33.3 t ADT: 77,596

HWY CHELSEA ST

Over: WATER LITTLE MYSTIC CHAN

UNDER TOBIN AT MORAN TERM, Suffolk, MA

Built 1982 Load: 33.3 t ADT: 4,008

HWY UKRAINE WAY

Over: RR AMTRAK/MBTA

S OF FOREST HILLS STATION, Suffolk, MA

Built 1982 Load: 33.3 t ADT: 5,400

HWY SUMMER ST

Over: WATER RESERVE CHANNEL

1. 6 KM SE OF FT PT CHAN, Suffolk, MA

Built 1892 Load: 33.4 t ADT: 29,200

I 93 /US1/ST3

Over: WATER NEPONSET RIVER

.8 KM S OF JCT SR 3A, Suffolk, MA

Built 1954 Load: 33.6 t ADT: 169,936

ST 99 ALFORD ST

Over: WATER MYSTIC RIVER

AT MYSTIC RIVER, Suffolk, MA

Built 1963 Load: 33.7 t ADT: 40,000

HWY SOHAMPTN ST

Over: COMB AMTRAK & RED LINE

E OF SE XWAY, Suffolk, MA

Built 1902 Load: 33.7 t ADT: 33,800

I 93 BT NB4-N ABT

Over: I 93 CONN D & K

1.9 KM N OF JCT US1&I93, Suffolk, MA

Built 1970 Load: 33.7 t ADT: 65,702

HWY HERALD ST

Over: RR CSX SPUR

AT INK BLOCK, Suffolk, MA

Built 1957 Load: 33.8 t ADT: 32,500

I 93 NB

Over: I 93 SB BT 57 - 61

.5 MI N OF JCT I93&US1, Suffolk, MA

Built 1970 Load: 33.8 t ADT: 37,000

I 93 SB BT 57-61

Over: RR MBTA & BMRR

.5 MI N OF JCT 193&US1, Suffolk, MA

Built 1970 Load: 33.8 t ADT: 87,100

HWY PORTER ST

Over: OTHER PEDESTRIAN WLKWY

15.2 M S OF SR 1A, Suffolk, MA

Built 1907 Load: 33.9 t ADT: 7,500

HWY WASHNGTN AVE

Over: WATER PINES RIVER

0.5 KM W. OF JCT. US 1, Suffolk, MA

Built 1950 Load: 33.9 t ADT: 17,700

I 93 /US1/ST3

Over: COMB MBTA & COLUMBIA RD

2 MI S OF JCT I90, Suffolk, MA

Built 1958 Load: 34.0 t ADT: 205,100

US 1 RAMP LC

Over: COMB US1SB/NB&MILLERS R

RAMP FROM RUTHERFORD AVE, Suffolk, MA

Built 1989 Load: 34.2 t ADT: 18,620

HWY COMM AVE EB

Over: WATER MUDDY RIVER

.3 MI E OF KENMORE SQ., Suffolk, MA

Built 1917 Load: 34.3 t ADT: 22,600

HWY MOUNTAIN AVE

Over: US 1 NE XWAY

1.76 KM N OF JCT SR16, Suffolk, MA

Built 1957 Load: 34.3 t ADT: 5,300

HWY FRNT RD NB

Over: OTHER RELIEF

JUST NORTH SO BY PASS RD, Suffolk, MA

Built 2000 Load: 34.9 t ADT: 42,155

HWY CAMBRIDGE ST

Over: COMB ORANGE & MBTA/BMRR

0.33 KM W SULLIVAN SQ., Suffolk, MA

Built 1880 Load: 35.0 t ADT: 23,000

I 93 /US1/ST3

Over: COMB MBTA & RED LN SSH

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

Built 1957 Load: 35.0 t ADT: 211,123

US 1 NE XWAY

Over: ST 60 EB/SQUIRE RD

1.6 KM W OF SR 107, Suffolk, MA

Built 1958 Load: 35.0 t ADT: 83,500

HWY BENNINGTN ST

Over: HWY MARTIN COUGHLIN BY

305 M S OF SUFFOLK DOWNS, Suffolk, MA

Built 1906 Load: 35.1 t ADT: 42,672

I 93 SB B10-B16RP

Over: RR MBTA & BMRR

.8 MI N OF JCT US1 & I93, Suffolk, MA

Built 1970 Load: 35.2 t ADT: 26,000

I 93 NB B10-B16

Over: I 93 SB B10-B16

1.0 MI N OF JCT I93 & US1, Suffolk, MA

Built 1970 Load: 35.2 t ADT: 58,882

HWY SUMMER ST

Over: HWY A ST

.16 KM SE FT PT CHANNEL, Suffolk, MA

Built 1918 Load: 35.6 t ADT: 12,931

HWY WESTERN AVE

Over: HWY SOLDIERS FIELD RD

.1 MI N OF BIRMINGHAM PKW, Suffolk, MA

Built 1968 Load: 35.6 t ADT: 26,900

ST 1 A

Over: HWY CHELSEA & BREMEN S

1000FT NE OF CALLHAN TUN., Suffolk, MA

Built 1951 Load: 35.7 t ADT: 56,250

HWY SAVIN HLL AV

Over: I 93 /US1/ST3

3.2 KM S OF JCT I93&90, Suffolk, MA

Built 1958 Load: 35.8 t ADT: 6,077

I 93 RAMP S-N

Over: OTHER RELIEF

RAMP STORROW DR. TO I93N, Suffolk, MA

Built 2005 Load: 36.3 t ADT: 8,800

HWY ADAMS ST

Over: TR RED LINE MATT CONN

.3 MI S. JCT SR, Suffolk, MA

Built 1886 Load: 36.5 t ADT: 21,000

US 1 NE XWAY

Over: HWY SARGENT ST

1 MI S OF ST-60, Suffolk, MA

Built 1956 Load: 36.6 t ADT: 83,793

HWY NORFOLK ST

Over: RR MBTA

.53 KM W OF JCTSR28&SR203, Suffolk, MA

Built 1901 Load: 36.7 t ADT: 13,400

ST 1 A

Over: HWY BNINGTN & NEPTUNE

1 MI N OF CALLAHAN TUN., Suffolk, MA

Built 1951 Load: 36.7 t ADT: 33,770

I 93 SB

Over: OTHER RELIEF

ALBANY ST / FRONTAGE RD, Suffolk, MA

Built 1997 Load: 36.7 t ADT: 45,270

ST107 SALEM TPK

Over: WATER PINES RIVER

1.4 KM NE OF RTE 60, Suffolk, MA

Built 2011 Load: 36.9 t ADT: 35,302

HWY FRNT RD NB

Over: OTHER RELIEF

MASS AVE. INT., Suffolk, MA

Built 2000 Load: 37.0 t ADT: 49,913

HWY CENTRAL AVE

Over: WATER NEPONSET RIVER

AT RIV & MILTON LINE, Suffolk, MA

Built 1973 Load: 37.1 t ADT: 13,488

I 93 /US1/ST3

Over: HWY CONLEY ST

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

Built 1955 Load: 37.2 t ADT: 183,369

HWY ADAMS ST

Over: WATER NEPONSET RIVER

OVER NEPONSET RIV AT MILT, Suffolk, MA

Built 1765 Load: 37.3 t ADT: 31,000

ST 1 A

Over: HWY SARATGA ST & U TRN

1.7 KM N OF CALLAHAN TUN, Suffolk, MA

Built 1951 Load: 37.3 t ADT: 86,897

HWY LONGWOOD AVE

Over: WATER MUDDY RIVER

.8 KM N OF JCT SR9&JWAY, Suffolk, MA

Built 1897 Load: 37.4 t ADT: 26,121

I 93 /US1/ST3

Over: HWY NEP AV/GALV/MRSY

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

Built 1955 Load: 37.5 t ADT: 158,879

ST 1 A/ON RAMP

Over: OTHER RELIEF

1.4 KM NE OF SUMNER TUN, Suffolk, MA

Built 1951 Load: 37.6 t ADT: 15,000

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