US Bridges

ST140 S Main ST over I 495

Fair

Bristol County, Massachusetts · Ex ST 140 NB & Old ST 140 · Structure no. M030333XVDOTNBI

Built
1978
47 years old, rebuilt 2008
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
296 ft
2 main spans
Daily traffic
24,569
2023 count
Owner
State
State Highway Agency

About this bridge

ST140 S Main ST over I 495 is a steel continuous stringer/multi-beam or girder carrying ST140 S Main ST over I 495 in Bristol County, Massachusetts. It was built in 1978 and reconstructed in 2008, so it is 47 years old, younger 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 6 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 24,569 vehicles a day, roughly 8% of them trucks, projected to reach 29,059 by 2032. The structure is 296 ft (90.1 m) long and 69 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesST140 S Main ST
CrossesI 495
LocationEx ST 140 NB & Old ST 140
RouteState Highway 140
CountyBristol County
StateMassachusetts
Coordinates42.00057, -71.2111
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78.9 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length296 ft (90.1 m)
Longest span148 ft (45.1 m)
Deck width69 ft (21.1 m)
Roadway width67 ft (20.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,569 (2023)
Projected traffic29,059 by 2032
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST140 S Main ST over I 495 built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2008.

What condition is ST140 S Main ST over I 495 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 September 2023.

How much traffic does ST140 S Main ST over I 495 carry?

About 24,569 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is ST140 S Main ST over I 495?

The structure is 296 ft (90.1 m) long with a longest span of 148 ft (45.1 m) and a deck 69 ft wide.

Who owns ST140 S Main ST over I 495?

It is owned by the State Highway Agency.