US Bridges

ST123 E Main ST over I 495

Poor

Bristol County, Massachusetts · ST 123 at I 495 · Structure no. N230333V2DOTNBI

Built
1978
47 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
248 ft
2 main spans
Daily traffic
25,200
2024 count
Owner
State
State Highway Agency

About this bridge

ST123 E Main ST over I 495 is a steel continuous stringer/multi-beam or girder carrying ST123 E 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 25,200 vehicles a day, roughly 6% of them trucks, projected to reach 28,427 by 2032. The structure is 248 ft (75.6 m) long and 101 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST123 E Main ST
CrossesI 495
LocationST 123 at I 495
RouteState Highway 123
CountyBristol County
StateMassachusetts
Coordinates41.98229, -71.15965
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 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 alignment9: Superior to present desirable criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length248 ft (75.6 m)
Longest span123 ft (37.5 m)
Deck width101 ft (30.9 m)
Roadway width93 ft (28.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,200 (2024)
Projected traffic28,427 by 2032
Trucks6%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$22.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST123 E Main ST over I 495 built?

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

What condition is ST123 E Main ST over I 495 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does ST123 E Main ST over I 495 carry?

About 25,200 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is ST123 E Main ST over I 495?

The structure is 248 ft (75.6 m) long with a longest span of 123 ft (37.5 m) and a deck 101 ft wide.

Who owns ST123 E Main ST over I 495?

It is owned by the State Highway Agency.