US Bridges

ST 1 A/Main ST over RR Mbta/Csx

Fair

Norfolk County, Massachusetts · .3 Mi. N. of ST27 · Structure no. W03013413DOT634

Built
1900
125 years old
Condition
Fair
inspected January 2024
Type
Arch - Deck
Masonry
Length
25 ft
1 main span
Daily traffic
22,500
2024 count
Owner
State
State Highway Agency

About this bridge

ST 1 A/Main ST over RR Mbta/Csx is a masonry arch - deck carrying ST 1 A/Main ST over RR Mbta/Csx in Norfolk County, Massachusetts. It was built in 1900, so it is 125 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 22,500 vehicles a day, roughly 3% of them trucks, projected to reach 28,112 by 2033. The structure is 25 ft (7.6 m) long and 203 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 1 A/Main ST
CrossesRR Mbta/Csx
Location.3 Mi. N. of ST27
RouteState Highway 1A
CountyNorfolk County
StateMassachusetts
Coordinates42.14988, -71.25013
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating36.3 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width203 ft (61.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,500 (2024)
Projected traffic28,112 by 2033
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 1 A/Main ST over RR Mbta/Csx built?

It was built in 1900, making it 125 years old in 2025.

What condition is ST 1 A/Main ST over RR Mbta/Csx 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 January 2024.

How much traffic does ST 1 A/Main ST over RR Mbta/Csx carry?

About 22,500 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is ST 1 A/Main ST over RR Mbta/Csx?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 203 ft wide.

Who owns ST 1 A/Main ST over RR Mbta/Csx?

It is owned by the State Highway Agency.