US Bridges

I 93 over HWY Concord ST

Fair

Middlesex County, Massachusetts · 2.4 KM Nly Rt 129 · Structure no. W380312HWDOTNBI

Built
1958
67 years old, rebuilt 1974
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
147 ft
3 main spans
Daily traffic
155,000
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 over HWY Concord ST is a steel continuous stringer/multi-beam or girder carrying I 93 over HWY Concord ST in Middlesex County, Massachusetts. It was built in 1958 and reconstructed in 1974, so it is 67 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 155,000 vehicles a day, roughly 10% of them trucks, projected to reach 236,895 by 2032. The structure is 147 ft (44.8 m) long and 172 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI 93
CrossesHWY Concord ST
Location2.4 KM Nly Rt 129
RouteInterstate 93
CountyMiddlesex County
StateMassachusetts
Coordinates42.55838, -71.14072
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating38.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length147 ft (44.8 m)
Longest span69 ft (21 m)
Deck width172 ft (52.5 m)
Roadway width164 ft (50 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic155,000 (2019)
Projected traffic236,895 by 2032
Trucks10%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$23 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 over HWY Concord ST built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1974.

What condition is I 93 over HWY Concord ST in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does I 93 over HWY Concord ST carry?

About 155,000 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is I 93 over HWY Concord ST?

The structure is 147 ft (44.8 m) long with a longest span of 69 ft (21 m) and a deck 172 ft wide.

Who owns I 93 over HWY Concord ST?

It is owned by the State Highway Agency.