US Bridges

ST 3 A/Main ST over Water South River

FairPosted for load

Plymouth County, Massachusetts · At JCT.139 · Structure no. M0700447JDOTNBI

Built
1947
78 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
28,241
2023 count
Owner
State
State Highway Agency

About this bridge

ST 3 A/Main ST over Water South River is a concrete tee beam carrying ST 3 A/Main ST over Water South River in Plymouth County, Massachusetts. It was built in 1947, so it is 78 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 28,241 vehicles a day, roughly 7% of them trucks, projected to reach 47,221 by 2032. The structure is 32 ft (9.8 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesST 3 A/Main ST
CrossesWater South River
LocationAt JCT.139
RouteState Highway 3A
CountyPlymouth County
StateMassachusetts
Coordinates42.09459, -70.71811
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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.1 US tons
Inventory rating34.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length32 ft (9.8 m)
Longest span27 ft (8.2 m)
Deck width42 ft (12.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,241 (2023)
Projected traffic47,221 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST 3 A/Main ST over Water South River built?

It was built in 1947, making it 78 years old in 2025.

What condition is ST 3 A/Main ST over Water South River 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 July 2023.

How much traffic does ST 3 A/Main ST over Water South River carry?

About 28,241 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is ST 3 A/Main ST over Water South River?

The structure is 32 ft (9.8 m) long with a longest span of 27 ft (8.2 m) and a deck 42 ft wide.

Who owns ST 3 A/Main ST over Water South River?

It is owned by the State Highway Agency.