Bridge conditions in Suffolk County, Massachusetts 490 inventoried bridges · 49 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled August 20, 2026
Suffolk County has 49 bridges rated poor out of 490 inventoried, a 10.0% share that puts it well above the national rate of about 7%.
49 of the 490 bridges in Suffolk County, Massachusetts, are rated in poor condition (10.0%) in the 2025 National Bridge Inventory, as of August 20, 2026 .110 bridges (22.4%) are rated good and 331 (67.6%) fair.
The median Suffolk County bridge was built in 1970 .
The busiest poor-rated bridge is Hwy Morrssey Blv over Water Dorchester Bay (built 1927), carrying about 78,900 vehicles a day.
Good 22.4% · Fair 67.6% · Poor 10.0% of 490 bridges
Bridges rated poor Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
Bridge Built Vehicles/day Condition Hwy Morrssey Blv over Water Dorchester Bay 1927 78,900 Poor I 93 Bt Sb4-n Abt over Hwy Connectors D & K 1970 77,596 Poor I 90 EB over RR Mbta 1965 76,373 Poor I 90 WB over RR Mbta 1965 74,344 Poor Hwy Storrw Dr WB over Hwy Storrow Dr EB 1951 57,770 Poor St 1 A/lee Brbnk over ST145 Revere Bch Pkwy 1934 55,630 Poor Hwy Bowker Int over Comb I 90 & Mbta 1965 55,075 Poor US 1 Nb/low Deck over Hwy Chelsea Local Stre 1950 42,492 Poor US 1 Sb/uppr Deck over US 1 Nb/chel Lwr Deck 1950 41,655 Poor Hwy Blue Hill Av over RR Mbta 1902 41,250 Poor St 16 Rev Bch Pkwy over ST107 Broadway 1931 36,500 Poor US 1 SB over US 1 NB 1994 34,040 Poor Hwy Cambridge St over Water Charles River 1925 33,400 Poor Hwy Storrw Dr EB over Hwy Bowkr on & Off Rps 1954 32,000 Poor Hwy Cambridge St over Comb I 90 & Mbta/csx 1964 31,600 Poor Hwy Trmnt-arlngt over RR Amtrak/mbta 1979 30,400 Poor St 28 Chas R Dm Rd over Water Charles River 1906 28,188 Poor Hwy Cambridge St over Comb I90 E Rps Bdl & Cs 1965 27,500 Poor Hwy W Roxbry Pky over RR Mbta 1921 27,414 Poor Hwy Beacon St over Comb I 90 & Mbta/csx 1965 26,911 Poor Hwy Arlington St over Comb I 90 & Amtrak 1965 25,800 Poor Hwy River St over RR Amtrak/mbta 1883 24,000 Poor Hwy Centre St over RR Mbta 1888 23,147 Poor Hwy Meridian St over Water Chelsea River 1954 22,435 Poor Hwy Mass Ave over Comb I 90 & Mbta/csx 1965 21,206 Poor I 90 EB Off- Ramp over I 90 WB & Ramps F D L 1964 20,700 Poor St 9 Huntingtn Av over Comb I 90 & Mbta/csx 1965 19,200 Poor Hwy Bwkr SB Onrp over Water Muddy River 1965 18,470 Poor Hwy Dalton St over Comb I 90&CAMBRIA&CSX 1850 17,844 Poor Hwy Congress St over Water Fort Point Channel 1850 17,100 Poor I 90 EB Ramps Off over RR Mbta/csx 1965 16,878 Poor Hwy County Rd over US 1 NE Xway 1955 16,422 Poor Hwy Canterbry St over RR Amtrak/mbta 1985 16,034 Poor Hwy Embkt WB on over Hwy Embankment Rd EB 1951 15,500 Poor Hwy Boston St over Tr Amtrak & Red Line 1977 15,300 Poor Hwy Dorchstr Ave over Comb Mbta & Red Ln 1924 11,800 Poor Hwy Dorchstr Ave over RR Mbta Spur 1925 11,800 Poor Hwy Tremont St over Comb I 90 & Amtrak 1965 11,000 Poor Hwy Boylston St over Comb I 90 & Mbta/csx 1965 10,300 Poor Hwy Walworth St over RR Mbta 1918 10,216 Poor Hwy Shawmut Ave over Comb I 90 & Amtrk/orng 1965 10,100 Poor Hwy Bwkr SB Onrp over Hwy Kenmore Off Rmp 1965 9,900 Poor Hwy Bwkr NB Ofrp over Other Relief 1965 8,315 Poor Hwy Harrison Ave over Comb I 90 & Amtrak/mbta 1965 7,500 Poor Hwy Comm Av Ofrp over Water Muddy River 1965 7,300 Poor Hwy Savin Hll Av over Tr Red Line 1925 6,700 Poor Hwy Park Ave over US 1 NE Xway 1957 4,050 Poor Hwy W Fourth St over Comb Haul Rd & CSX 1918 3,500 Poor Hwy Mishawum St over St 99 Sullivan Sq Undrps 1951 2,845 Poor
Busiest bridges in the county Bridge Built Vehicles/day Condition I 93 /US1/ST3 over Comb Mbta & Red Ln Ssh 1957 211,123 Fair I 93 /US1/ST3 over Hwy Victory Rd 1955 193,593 Fair I 93 /US1/ST3 over Hwy Conley St 1955 193,593 Fair I 93 /US1/ST3 over Comb Mbta & Columbia Rd 1958 193,500 Fair I 93 /US1/ST3 over Hwy Hallet Street 1956 190,508 Fair I 93 /US1/ST3 over RR CSX Spur 1958 188,320 Fair I 93 /US1/ST3 over Hwy Morrissey Blvd 1958 188,320 Fair I 93 /US1/ST3 over Hwy Theatre Access Rd 1957 177,033 Fair I 93 /US1/ST3 over Hwy Nep Av/galv/mrsy 1955 173,365 Fair I 93 /US1/ST3 over Other Ped/ Bike Path 1956 171,195 Fair
Source: FHWA National Bridge Inventory , 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Massachusetts: Massachusetts bridge conditions by county · every download on the data page .
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected .