US Bridges

I 93 Ramps Sn NS over RR MBTA

Fair

Suffolk County, Massachusetts · I93 US1 Interchange · Structure no. B166059TXDOTNBI

Built
1999
26 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
434 ft
3 main spans
Daily traffic
60,517
2024 count
Owner
State
State Highway Agency

About this bridge

I 93 Ramps Sn NS over RR MBTA is a steel continuous box beam or girders - multiple carrying I 93 Ramps Sn 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 60,517 vehicles a day, roughly 3% of them trucks, projected to reach 17,372 by 2031. The structure is 434 ft (132.3 m) long and 57 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI 93 Ramps Sn NS
CrossesRR MBTA
LocationI93 US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37841, -71.07639
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.4 US tons
Inventory rating55.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length434 ft (132.3 m)
Longest span147 ft (44.8 m)
Deck width57 ft (17.3 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60,517 (2024)
Projected traffic17,372 by 2031
Trucks3%
Lanes on structure3
Traffic directionTwo-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$9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 Ramps Sn NS over RR MBTA built?

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

What condition is I 93 Ramps Sn 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 September 2024.

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

About 60,517 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is I 93 Ramps Sn NS over RR MBTA?

The structure is 434 ft (132.3 m) long with a longest span of 147 ft (44.8 m) and a deck 57 ft wide.

Who owns I 93 Ramps Sn NS over RR MBTA?

It is owned by the State Highway Agency.