US Bridges

HWY Sea ST over Water South River

Good

Plymouth County, Massachusetts · Marshfield-Scituate Line · Structure no. M07003AQDMUNNBI

Built
2010
15 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
417 ft
8 main spans
Daily traffic
4,009
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

HWY Sea ST over Water South River is a prestressed concrete box beam or girders - single or spread carrying HWY Sea ST over Water South River in Plymouth County, Massachusetts. It was built in 2010, so it is 15 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,009 vehicles a day, roughly 6% of them trucks, projected to reach 37,903 by 2032. The structure is 417 ft (127.2 m) long and 49 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesHWY Sea ST
CrossesWater South River
LocationMarshfield-Scituate Line
RouteCity Street 0
Coordinates42.13762, -70.69343
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.2 US tons
Inventory rating60.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 25 or greater
Structure length417 ft (127.2 m)
Longest span60 ft (18.3 m)
Deck width49 ft (14.8 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,009 (2023)
Projected traffic37,903 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$10.2 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was HWY Sea ST over Water South River built?

It was built in 2010, making it 15 years old in 2025.

What condition is HWY Sea ST over Water South River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does HWY Sea ST over Water South River carry?

About 4,009 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is HWY Sea ST over Water South River?

The structure is 417 ft (127.2 m) long with a longest span of 60 ft (18.3 m) and a deck 49 ft wide.

Who owns HWY Sea ST over Water South River?

It is owned by the Town or Township Highway Agency.