US Bridges

US 1 Ramp Tc over RR MBTA

Fair

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B1639282FDOTNBI

Built
2002
23 years old
Condition
Fair
inspected February 2025
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
387 ft
3 main spans
Daily traffic
51,207
2022 count
Owner
State
State Highway Agency

About this bridge

US 1 Ramp Tc over RR MBTA is a prestressed concrete continuous segmental box girder carrying US 1 Ramp Tc over RR MBTA in Suffolk County, Massachusetts. It was built in 2002, so it is 23 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 51,207 vehicles a day, roughly 8% of them trucks, projected to reach 349,025 by 2031. The structure is 387 ft (118 m) long and 44 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesUS 1 Ramp Tc
CrossesRR MBTA
LocationI93/US1 Interchange
RouteU.S. Route 1
CountySuffolk County
StateMassachusetts
Coordinates42.37199, -71.06942
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
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 rating87.5 US tons
Inventory rating48.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans3
Design loadHS 25 or greater
Structure length387 ft (118 m)
Longest span153 ft (46.6 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,207 (2022)
Projected traffic349,025 by 2031
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed2.5 mi (4 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 1 Ramp Tc over RR MBTA built?

It was built in 2002, making it 23 years old in 2025.

What condition is US 1 Ramp Tc 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 2025.

How much traffic does US 1 Ramp Tc over RR MBTA carry?

About 51,207 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is US 1 Ramp Tc over RR MBTA?

The structure is 387 ft (118 m) long with a longest span of 153 ft (46.6 m) and a deck 44 ft wide.

Who owns US 1 Ramp Tc over RR MBTA?

It is owned by the State Highway Agency.