US Bridges

I 93 Ramp Sn over US 1 Ramp Tc & Lc

Good

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B166078YPDOTNBI

Built
1999
26 years old
Condition
Good
inspected August 2023
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
783 ft
6 main spans
Daily traffic
38,009
2022 count
Owner
State
State Highway Agency

About this bridge

I 93 Ramp Sn over US 1 Ramp Tc & Lc is a prestressed concrete continuous segmental box girder carrying I 93 Ramp Sn over US 1 Ramp Tc & Lc 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 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 38,009 vehicles a day, roughly 8% of them trucks, projected to reach 275,793 by 2032. The structure is 783 ft (238.6 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI 93 Ramp Sn
CrossesUS 1 Ramp Tc & Lc
LocationI93/US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37067, -71.06618
Functional classUrban Principal Arterial - Interstate

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
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 alignment8: Equal to present desirable criteria
Operating rating109.1 US tons
Inventory rating57.1 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans6
Design loadHS 20
Structure length783 ft (238.6 m)
Longest span144 ft (43.9 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic38,009 (2022)
Projected traffic275,793 by 2032
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$7.3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 Ramp Sn over US 1 Ramp Tc & Lc built?

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

What condition is I 93 Ramp Sn over US 1 Ramp Tc & Lc 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 August 2023.

How much traffic does I 93 Ramp Sn over US 1 Ramp Tc & Lc carry?

About 38,009 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is I 93 Ramp Sn over US 1 Ramp Tc & Lc?

The structure is 783 ft (238.6 m) long with a longest span of 144 ft (43.9 m) and a deck 36 ft wide.

Who owns I 93 Ramp Sn over US 1 Ramp Tc & Lc?

It is owned by the State Highway Agency.