US Bridges

I 93 Ramp NS over RR MBTA

Fair

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B166049DFDOTNBI

Built
1999
26 years old
Condition
Fair
inspected February 2022
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
901 ft
6 main spans
Daily traffic
19,352
2016 count
Owner
State
State Highway Agency

About this bridge

I 93 Ramp NS over RR MBTA is a steel continuous box beam or girders - multiple carrying I 93 Ramp NS over RR MBTA in Suffolk County, Massachusetts. It was built in 1999, so it is 26 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 19,352 vehicles a day, roughly 2% of them trucks. The structure is 901 ft (274.5 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI 93 Ramp NS
CrossesRR MBTA
LocationI93/US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.3806, -71.07767
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2022
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 rating91.8 US tons
Inventory rating55 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length901 ft (274.5 m)
Longest span157 ft (47.9 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,352 (2016)
Projected traffic—
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.7 mi (6 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 statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$644,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 Ramp NS over RR MBTA built?

It was built in 1999, making it 26 years old in 2025.

What condition is I 93 Ramp NS over RR MBTA 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 February 2022.

How much traffic does I 93 Ramp NS over RR MBTA carry?

About 19,352 vehicles per day (2016 count), of which roughly 2% are trucks.

How long is I 93 Ramp NS over RR MBTA?

The structure is 901 ft (274.5 m) long with a longest span of 157 ft (47.9 m) and a deck 40 ft wide.

Who owns I 93 Ramp NS over RR MBTA?

It is owned by the State Highway Agency.