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Bridge conditions in Middlesex County, Massachusetts

821 inventoried bridges · 91 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Of the 821 Middlesex County bridges in the federal inventory, 91 carry a poor rating. That 11.1% share is roughly 2x the national average.

91 of the 821 bridges in Middlesex County, Massachusetts, are rated in poor condition (11.1%) in the 2025 National Bridge Inventory, as of August 20, 2026.
170 bridges (20.7%) are rated good and 560 (68.2%) fair.
The median Middlesex County bridge was built in 1960.
The busiest poor-rated bridge is I 93 over I 95 /ST128 (built 1957), carrying about 200,824 vehicles a day.

Good 20.7% · Fair 68.2% · Poor 11.1% of 821 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
I 93 over I 95 /ST128	1957	200,824	Poor
I 95 /ST128 over RR Mbta/bmrr	1950	192,672	Poor
I 93 over St 16 Myst Val Pky	1960	182,420	Poor
I 95 ST128 over Hwy Quinobequin Rd	1950	142,579	Poor
I 90 over RR CSX	1957	114,872	Poor
St 9 Boylston St over Tr Green Line D	1905	96,206	Poor
I 95 SB/ST128 SB over St 3 A/cambridge St	1950	93,600	Poor
I 95 SB/ST128 SB over Hwy S Bedford St	1950	92,706	Poor
St 3 A/gorham St over I 495	1962	84,000	Poor
I 90 Ramps A & B over Water Charles River	1957	80,100	Poor
I 495 SB over RR Pan Am	1961	68,981	Poor
I 495 SB over St 38 Main St	1961	68,981	Poor
I 495 NB over RR Pan Am	1961	64,233	Poor
I 495 NB over ST133 Andover St	1961	60,988	Poor
I 495 SB over Hwy Boston Rd	1959	59,349	Poor
St 2 over Hwy Lake St	1967	56,236	Poor
I 495 NB over Water Assabet River	1963	55,989	Poor
I 495 NB over Hwy Boston Rd	1959	53,253	Poor
I 90 EB over ST135 Wood St	1957	50,658	Poor
I 495 NB over Hwy W Main St	1966	48,152	Poor
I 495 NB over I 90	1965	48,021	Poor
I 495 SB over Water Assabet River	1963	47,879	Poor
St 2 Concord Tpk over Water Sudbury River	1934	46,700	Poor
I 90 Ex 117 In 13 over I 90	1957	45,000	Poor
I 495 NB over Hwy Tadmuck Rd	1961	43,917	Poor
I 495 SB over Hwy Berlin Rd	1963	42,765	Poor
I 495 SB over Hwy W Main St	1966	38,043	Poor
St 60 Pleasant St over St 2	1967	36,700	Poor
I 90 Ramp G over Other Mdc Aqueduct	1962	36,206	Poor
Hwy Speen St SB over St 9 & Ramp A	1977	34,773	Poor
St 28 Mcgrath Hwy over RR Mbta/bmrr	1926	32,000	Poor
Hwy Centre St over Comb I 90 & Csx/mbta	1964	31,422	Poor
Hwy Webster Ave over RR Mbta/bmrr	1911	27,350	Poor
ST129 Lowell St over I 93	1957	26,250	Poor
US 3 /ST2&16/ALWF over Tr Red Line	1983	25,732	Poor
Hwy Trapelo Rd over I 95 /ST128	1960	24,727	Poor
Hwy Walnut St over Tr Green Line D	1906	24,569	Poor
St 2 A/marrett Rd over I 95 /ST128	1961	23,310	Poor
US 3 NB over I 95 /ST128 & Cd	1962	22,600	Poor
US 20 Eb/weston St over I 95 /ST128	1960	22,500	Poor
Hwy Speen St NB over St 9 Worcester St	1977	21,600	Poor
Hwy Farwell St over Water Charles River	1850	21,600	Poor
Hwy Park Ave over St 2	1967	20,450	Poor
Hwy Walnut St over Comb I 90 & Csx/mbta	1964	19,784	Poor
I 93 NB Offramp over St 38 Nb/mystic Ave	1973	19,267	Poor
St 3 Nb/memorl Dr over Water Charles River	1956	18,750	Poor
ST117 Main St over I 95 /ST128	1962	18,600	Poor
US 3 Memorial Dr over Hwy Brookline St	1940	18,503	Poor
St 16 Wb/wshgtn St over Comb I 90 & Csx/mbta	1964	18,491	Poor
St 28 Mcgrath Hwy over Comb Som Ave Ext & Mbta	1958	18,436	Poor
Hwy Bridge St over Water Eastern Canal	1937	18,230	Poor
Hwy NB Lowll Con over I 495	1959	17,180	Poor
Hwy First St over Water Broad Canal	1924	15,388	Poor
Hwy Lowell Ave over Comb I 90 & Csx/mbta	1964	14,224	Poor
St 3 A/gorham St over Water River Meadow Brook	1960	14,012	Poor
Hwy Mishawum Rd over I 95 /ST128	1961	13,700	Poor
Hwy Winthrop St over Water Mystic River	1926	13,500	Poor
Hwy Speen St over RR Mbta/csx	1900	13,000	Poor
Hwy Land Blvd over Water Broad Canal	1956	12,579	Poor
St 38 Main St over RR Mbta/bmrr	1928	12,500	Poor
ST113 Main St over Water Nashua River	1937	12,478	Poor
ST119 /ST2 A over Water Nashoba Brook	1940	12,463	Poor
Hwy Watertown St over St 2	1967	11,600	Poor
St 62 Main St over Water Assabet River	1922	11,163	Poor
Hwy SB Lowll Con over I 495	1959	11,013	Poor
Hwy Boylston St over I 495	1961	10,600	Poor
I 90 Ex 111 In 12 over St 9 Worcester Rd	1957	10,271	Poor
ST225 Bedford Rd over Water Concord River	1955	9,750	Poor
Hwy Auburn St over Comb I 90 & Csx/mbta	1964	9,181	Poor
St 28 Fellsway W over I 93	1959	9,181	Poor
Hwy Lwl Con B-11 over I 495	1959	8,952	Poor
ST119 Main St over Water Pearl Hill Brook	1907	8,542	Poor
Hwy Lwll Cn B-10 over Hwy Lowel Con Ramp B8	1959	7,860	Poor
Hwy Huron Ave over Other Greenway M/u Path	1985	7,100	Poor
Hwy Cordavlle Rd over Water Sudbury River	1870	7,063	Poor
ST126 Concord Rd over RR Mbta/bmrr	1950	6,853	Poor
Hwy Highland St over Comb I 90 & Csx/mbta	1964	6,724	Poor
Hwy North St over I 495	1961	6,200	Poor
Hwy Chestnut St over Water Ipswich River	1967	5,200	Poor
ST111 Mass Ave over I 495	1963	4,604	Poor
Hwy Sudbury Rd over Water Assabet River	1902	4,400	Poor
ST119 State Rd over Water S Br Souhegan Riv	1962	4,162	Poor
Hwy Westford St over I 495	1961	4,000	Poor
Hwy South Rd over Water Elm Brook	1970	3,750	Poor
Hwy Hall St over Water Western Canal	1910	3,500	Poor
Hwy Pleasant St over Water Sewer Canal	1904	2,636	Poor
Hwy Trull Rd over I 495	1962	1,810	Poor
Hwy Lincoln Rd over Water Sudbury River	1992	1,551	Poor
Hwy Boden Ln over RR Mbta/csx	1891	1,300	Poor
Hwy Box Mill Rd over Water Elizabeth Brook	1900	10	Poor
Hwy Suffolk St over Water Northern Canal	1848	–	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I 93 over St 60 Eb/salem St	1961	266,500	Fair
I 93 over St 60 Wb/salem St	1961	266,500	Fair
I 93 over Water Mystic River	1963	250,350	Fair
I 93 over Hwy Valley St & Fllswy	1961	210,316	Fair
I 93 over Hwy Montvale Ave	1958	208,231	Fair
I 93 over I 95 /ST128	1957	200,824	Poor
I 95 /ST128 over Hwy Lincoln St	1950	196,500	Fair
I 93 over Hwy Webster St	1961	194,827	Fair
I 95 /ST128 over RR Mbta/bmrr	1950	192,672	Poor
I 93 over Other Tri Community Gree	1958	190,000	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

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