US Bridges

HWY Dartmouth ST over RR Amtrak/Mbta

Good

Suffolk County, Massachusetts · .16 KM S of I90/COPLY Pl. · Structure no. B160853HNDOT634

Built
1983
42 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
75 ft
1 main span
Daily traffic
27,310
2016 count
Owner
State
State Highway Agency

About this bridge

HWY Dartmouth ST over RR Amtrak/Mbta is a steel stringer/multi-beam or girder carrying HWY Dartmouth ST over RR Amtrak/Mbta in Suffolk County, Massachusetts. It was built in 1983, so it is 42 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 27,310 vehicles a day, roughly 3% of them trucks, projected to reach 23,690 by 2033. The structure is 75 ft (22.9 m) long and 100 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Dartmouth ST
CrossesRR Amtrak/Mbta
Location.16 KM S of I90/COPLY Pl.
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.34711, -71.07587
Functional classUrban Minor Arterial

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.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length75 ft (22.9 m)
Longest span72 ft (22 m)
Deck width100 ft (30.4 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,310 (2016)
Projected traffic23,690 by 2033
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Dartmouth ST over RR Amtrak/Mbta built?

It was built in 1983, making it 42 years old in 2025.

What condition is HWY Dartmouth ST over RR Amtrak/Mbta 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 December 2024.

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

About 27,310 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is HWY Dartmouth ST over RR Amtrak/Mbta?

The structure is 75 ft (22.9 m) long with a longest span of 72 ft (22 m) and a deck 100 ft wide.

Who owns HWY Dartmouth ST over RR Amtrak/Mbta?

It is owned by the State Highway Agency.