US Bridges

I 93 NB over I 93 Sb/Rmp Lt/Mil Rv

Fair

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B16600901DOTNBI

Built
2002
23 years old
Condition
Fair
inspected February 2022
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
1,015 ft
7 main spans
Daily traffic
79,712
2018 count
Owner
State
State Highway Agency

About this bridge

I 93 NB over I 93 Sb/Rmp Lt/Mil Rv is a prestressed concrete continuous segmental box girder carrying I 93 NB over I 93 Sb/Rmp Lt/Mil Rv 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 79,712 vehicles a day, roughly 9% of them trucks, projected to reach 74,202 by 2031. The structure is 1,015 ft (309.4 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI 93 NB
CrossesI 93 Sb/Rmp Lt/Mil Rv
LocationI93/US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37022, -71.06482
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating28.7 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans7
Design loadHS 25 or greater
Structure length1,015 ft (309.4 m)
Longest span145 ft (44.2 m)
Deck width60 ft (18.3 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic79,712 (2018)
Projected traffic74,202 by 2031
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$55.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 NB over I 93 Sb/Rmp Lt/Mil Rv built?

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

What condition is I 93 NB over I 93 Sb/Rmp Lt/Mil Rv 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 NB over I 93 Sb/Rmp Lt/Mil Rv carry?

About 79,712 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is I 93 NB over I 93 Sb/Rmp Lt/Mil Rv?

The structure is 1,015 ft (309.4 m) long with a longest span of 145 ft (44.2 m) and a deck 60 ft wide.

Who owns I 93 NB over I 93 Sb/Rmp Lt/Mil Rv?

It is owned by the State Highway Agency.