Middlesex County, MA

820 public highway bridges

Middlesex County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Middlesex County, Massachusetts contains 820 public highway bridges. Roughly 20.4% are rated “Good,” 61.1% “Fair,” and 8.8% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

820
Total Bridges
20.4%
Good
61.1%
Fair
8.8%
Poor Condition

Condition Distribution

Good
20.4% (167)
Fair
61.1% (501)
Poor
8.8% (72)

All Bridges (820)

I 495 NB

Poor

Over: HWY TADMUCK RD

0.4 MI N OF RT 110, Middlesex, MA

Built 1961 Load: 33.7 t ADT: 97,289

ST119 /ST2 A

Poor

Over: WATER NASHOBA BROOK

0.25 MI S OF 27 & 2A, Middlesex, MA

Built 1940 Load: 33.9 t ADT: 12,463

I 495 NB

Poor

Over: HWY W MAIN ST

1.1 MI S OF ST-135, Middlesex, MA

Built 1966 Load: 33.9 t ADT: 48,152

I 95 /ST128

Poor

Over: RR MBTA/BMRR

1.6 KM W OF I-93 & I-95, Middlesex, MA

Built 1950 Load: 34.1 t ADT: 192,672

I 495 SB

Poor

Over: HWY W MAIN ST

MM 54.6, Middlesex, MA

Built 1966 Load: 34.3 t ADT: 42,766

HWY LWL CON B-11

Poor

Over: I 495

0.4 KM E RT 495 & RT 3, Middlesex, MA

Built 1959 Load: 35.0 t ADT: 8,952

I 93

Poor

Over: ST 16 MYST VAL PKY

1 MI S OF JCT I93 & SR60, Middlesex, MA

Built 1960 Load: 35.6 t ADT: 182,420

I 495 NB

Poor

Over: HWY BOSTON RD

EXIT 83/N OF 110, Middlesex, MA

Built 1959 Load: 37.4 t ADT: 53,253

I 495 SB

Poor

Over: HWY BOSTON RD

0.2 MI N OF ST-110, Middlesex, MA

Built 1959 Load: 37.4 t ADT: 55,292

ST110 SB SMTH RTY

Poor

Over: HWY LOWELL-LWRNCE BLVD

WEST BRIDGE SMITH RTY, Middlesex, MA

Built 1954 Load: 40.6 t ADT: 5,690

ST 38 NB SMITH RTY

Poor

Over: HWY LOWELL-LWRNCE BLVD

EAST BRIDGE SMITH RTY, Middlesex, MA

Built 1954 Load: 42.3 t ADT: 13,060

ST113 MAIN ST

Poor

Over: WATER NASHUA RIVER

0.1 MI ELY CANAL ST, Middlesex, MA

Built 1937 Load: 43.1 t ADT: 12,017

US 3 NB

Poor

Over: I 95 /ST128 & CD

RT 3 AT RT 128, Middlesex, MA

Built 1962 Load: 45.7 t ADT: 22,600

HWY BOX MILL RD

Poor

Over: WATER ELIZABETH BROOK

60M N OF BRKSD AVE, Middlesex, MA

Built 1900 Load: 49.5 t ADT: 10

I 90 WB RAMP OFF

Poor

Over: RR CSX/MBTA

AT INT 17 S32, Middlesex, MA

Built 1964 Load: 49.6 t ADT: 18,362

I 90 RAMP G

Poor

Over: OTHER MDC AQUEDUCT

AT INT 15 S4B, Middlesex, MA

Built 1962 Load: 51.9 t ADT: 36,206

ST 2 CONCORD TPK

Poor

Over: WATER SUDBURY RIVER

2.8 KM SE RT 2 ROTARY, Middlesex, MA

Built 1934 Load: 64.3 t ADT: 46,700

HWY CHESTNUT ST

Poor

Over: WATER IPSWICH RIVER

0.16 KM. S. OF RTE. 62, Middlesex, MA

Built 1967 Load: 72.4 t ADT: 5,200

ST119 STATE RD

Poor

Over: WATER S BR SOUHEGAN RIV

500' W. OF BREED RD., Middlesex, MA

Built 1962 Load: 99.9 t ADT: 4,097

HWY PLEASANT ST

Poor

Over: WATER SEWER CANAL

.3MI S. OF STATE 16, Middlesex, MA

Built 1904 Load: 99.9 t ADT: 2,636

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.