US Bridges

I 93 NB over HWY W Fourth ST

Fair

Suffolk County, Massachusetts · B16661B Unit 1 · Structure no. B166618R0DOTNBI

Built
2002
23 years old
Condition
Fair
inspected March 2022
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
619 ft
5 main spans
Daily traffic
82,300
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 NB over HWY W Fourth ST is a prestressed concrete continuous segmental box girder carrying I 93 NB over HWY W Fourth ST 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 5 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 82,300 vehicles a day, projected to reach 132,819 by 2031. The structure is 619 ft (188.6 m) long and 54 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 93 NB
CrossesHWY W Fourth ST
LocationB16661B Unit 1
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.34284, -71.06179
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating44.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans5
Design loadHS 20
Structure length619 ft (188.6 m)
Longest span150 ft (45.7 m)
Deck width54 ft (16.5 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic82,300 (2019)
Projected traffic132,819 by 2031
Trucks0%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$30.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 NB over HWY W Fourth ST built?

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

What condition is I 93 NB over HWY W Fourth ST 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 March 2022.

How much traffic does I 93 NB over HWY W Fourth ST carry?

About 82,300 vehicles per day (2019 count).

How long is I 93 NB over HWY W Fourth ST?

The structure is 619 ft (188.6 m) long with a longest span of 150 ft (45.7 m) and a deck 54 ft wide.

Who owns I 93 NB over HWY W Fourth ST?

It is owned by the State Highway Agency.