US Bridges

ST104 N Main ST over I 495

Fair

Bristol County, Massachusetts · ST 104 at I 495 · Structure no. R020263VFDOTNBI

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
243 ft
2 main spans
Daily traffic
7,059
2022 count
Owner
State
State Highway Agency

About this bridge

ST104 N Main ST over I 495 is a steel stringer/multi-beam or girder carrying ST104 N Main ST over I 495 in Bristol County, Massachusetts. It was built in 1978, 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 7,059 vehicles a day, roughly 6% of them trucks, projected to reach 14,056 by 2032. The structure is 243 ft (74.1 m) long and 49 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesST104 N Main ST
CrossesI 495
LocationST 104 at I 495
RouteState Highway 104
CountyBristol County
StateMassachusetts
Coordinates41.9574, -71.04394
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment9: Superior to present desirable criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length243 ft (74.1 m)
Longest span119 ft (36.3 m)
Deck width49 ft (15 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,059 (2022)
Projected traffic14,056 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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$1.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST104 N Main ST over I 495 built?

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

What condition is ST104 N 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 May 2023.

How much traffic does ST104 N Main ST over I 495 carry?

About 7,059 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is ST104 N Main ST over I 495?

The structure is 243 ft (74.1 m) long with a longest span of 119 ft (36.3 m) and a deck 49 ft wide.

Who owns ST104 N Main ST over I 495?

It is owned by the State Highway Agency.