US Bridges

HWY Dartmouth ST over HWY I 90

Fair

Suffolk County, Massachusetts · At Copley Place S62 · Structure no. B160484TBDOTNBI

Built
1965
60 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
362 ft
2 main spans
Daily traffic
14,612
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Dartmouth ST over HWY I 90 is a steel stringer/multi-beam or girder carrying HWY Dartmouth ST over HWY I 90 in Suffolk County, Massachusetts. It was built in 1965, so it is 60 years old, younger 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.

It carries about 14,612 vehicles a day, roughly 6% of them trucks, projected to reach 14,056 by 2031. The structure is 362 ft (110.3 m) long and 82 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHWY Dartmouth ST
CrossesHWY I 90
LocationAt Copley Place S62
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.34786, -71.07625
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length362 ft (110.3 m)
Longest span69 ft (21 m)
Deck width82 ft (25.1 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,612 (2024)
Projected traffic14,056 by 2031
Trucks6%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$6.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Dartmouth ST over HWY I 90 built?

It was built in 1965, making it 60 years old in 2025.

What condition is HWY Dartmouth ST over HWY I 90 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 November 2024.

How much traffic does HWY Dartmouth ST over HWY I 90 carry?

About 14,612 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is HWY Dartmouth ST over HWY I 90?

The structure is 362 ft (110.3 m) long with a longest span of 69 ft (21 m) and a deck 82 ft wide.

Who owns HWY Dartmouth ST over HWY I 90?

It is owned by the State Highway Agency.