US Bridges

I 95 /ST128 over ST129 WB Main ST

Fair

Middlesex County, Massachusetts · 95/128 at ST-129 WB · Structure no. W010152FLDOTNBI

Built
1949
76 years old, rebuilt 1959
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
128,500
2024 count
Owner
State
State Highway Agency

About this bridge

I 95 /ST128 over ST129 WB Main ST is a steel stringer/multi-beam or girder carrying I 95 /ST128 over ST129 WB Main ST in Middlesex County, Massachusetts. It was built in 1949 and reconstructed in 1959, so it is 76 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 128,500 vehicles a day, roughly 7% of them trucks, projected to reach 214,785 by 2031. The structure is 67 ft (20.4 m) long and 154 ft wide.

Location

Open in Google Maps
CarriesI 95 /ST128
CrossesST129 WB Main ST
Location95/128 at ST-129 WB
RouteInterstate 95
CountyMiddlesex County
StateMassachusetts
Coordinates42.5256, -71.07948
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.8 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length67 ft (20.4 m)
Longest span63 ft (19.2 m)
Deck width154 ft (46.9 m)
Roadway width146 ft (44.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic128,500 (2024)
Projected traffic214,785 by 2031
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$9.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 95 /ST128 over ST129 WB Main ST built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1959.

What condition is I 95 /ST128 over ST129 WB Main 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 November 2024.

How much traffic does I 95 /ST128 over ST129 WB Main ST carry?

About 128,500 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is I 95 /ST128 over ST129 WB Main ST?

The structure is 67 ft (20.4 m) long with a longest span of 63 ft (19.2 m) and a deck 154 ft wide.

Who owns I 95 /ST128 over ST129 WB Main ST?

It is owned by the State Highway Agency.