US Bridges

ST 18 Main ST over ST 3

FairPosted for load

Norfolk County, Massachusetts · 1.4 KM E Braintree T.L. · Structure no. W32023348DOTNBI

Built
1957
68 years old, rebuilt 1980
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
144 ft
2 main spans
Daily traffic
47,327
2023 count
Owner
State
State Highway Agency

About this bridge

ST 18 Main ST over ST 3 is a steel stringer/multi-beam or girder carrying ST 18 Main ST over ST 3 in Norfolk County, Massachusetts. It was built in 1957 and reconstructed in 1980, so it is 68 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 6 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 47,327 vehicles a day, roughly 10% of them trucks, projected to reach 78,017 by 2032. The structure is 144 ft (43.9 m) long and 89 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST 18 Main ST
CrossesST 3
Location1.4 KM E Braintree T.L.
RouteState Highway 18
CountyNorfolk County
StateMassachusetts
Coordinates42.19461, -70.95576
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.6 US tons
Inventory rating22.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length144 ft (43.9 m)
Longest span74 ft (22.6 m)
Deck width89 ft (27.2 m)
Roadway width77 ft (23.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,327 (2023)
Projected traffic78,017 by 2032
Trucks10%
Lanes on structure4
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$11.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 18 Main ST over ST 3 built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1980.

What condition is ST 18 Main ST over ST 3 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 June 2023.

How much traffic does ST 18 Main ST over ST 3 carry?

About 47,327 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is ST 18 Main ST over ST 3?

The structure is 144 ft (43.9 m) long with a longest span of 74 ft (22.6 m) and a deck 89 ft wide.

Who owns ST 18 Main ST over ST 3?

It is owned by the State Highway Agency.