US Bridges

HWY S Main ST over RR Amtrak/Mbta

FairPosted for load

Norfolk County, Massachusetts · 1.2 MI SW of Depot ST · Structure no. S0900140QDOT634

Built
1937
88 years old
Condition
Fair
inspected April 2023
Type
Girder and Floorbeam System
Steel
Length
80 ft
1 main span
Daily traffic
30,300
2023 count
Owner
State
State Highway Agency

About this bridge

HWY S Main ST over RR Amtrak/Mbta is a steel girder and floorbeam system carrying HWY S Main ST over RR Amtrak/Mbta in Norfolk County, Massachusetts. It was built in 1937, so it is 88 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. Its operating status is: posted for load restriction.

It carries about 30,300 vehicles a day, roughly 4% of them trucks, projected to reach 36,166 by 2032. The structure is 80 ft (24.4 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHWY S Main ST
CrossesRR Amtrak/Mbta
Location1.2 MI SW of Depot ST
RouteCity Street 0
CountyNorfolk County
StateMassachusetts
Coordinates42.1112, -71.19168
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating43.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length80 ft (24.4 m)
Longest span72 ft (21.8 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,300 (2023)
Projected traffic36,166 by 2032
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY S Main ST over RR Amtrak/Mbta built?

It was built in 1937, making it 88 years old in 2025.

What condition is HWY S Main ST over RR Amtrak/Mbta 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 April 2023.

How much traffic does HWY S Main ST over RR Amtrak/Mbta carry?

About 30,300 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is HWY S Main ST over RR Amtrak/Mbta?

The structure is 80 ft (24.4 m) long with a longest span of 72 ft (21.8 m) and a deck 44 ft wide.

Who owns HWY S Main ST over RR Amtrak/Mbta?

It is owned by the State Highway Agency.