US Bridges

I 93 SB over HWY W Fourth ST

Fair

Suffolk County, Massachusetts · Unit 1 · Structure no. B166569AJDOTNBI

Built
2000
25 years old
Condition
Fair
inspected February 2023
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
300 ft
2 main spans
Daily traffic
164,570
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 SB over HWY W Fourth ST is a prestressed concrete continuous segmental box girder carrying I 93 SB over HWY W Fourth ST in Suffolk County, Massachusetts. It was built in 2000, so it is 25 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 164,570 vehicles a day, roughly 8% of them trucks, projected to reach 144,980 by 2032. The structure is 300 ft (91.3 m) long and 90 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 93 SB
CrossesHWY W Fourth ST
LocationUnit 1
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.34295, -71.06227
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.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating80.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans2
Design loadHS 25 or greater
Structure length300 ft (91.3 m)
Longest span150 ft (45.8 m)
Deck width90 ft (27.3 m)
Roadway width87 ft (26.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic164,570 (2019)
Projected traffic144,980 by 2032
Trucks8%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$6.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 2000, making it 25 years old in 2025.

What condition is I 93 SB 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 February 2023.

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

About 164,570 vehicles per day (2019 count), of which roughly 8% are trucks.

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

The structure is 300 ft (91.3 m) long with a longest span of 150 ft (45.8 m) and a deck 90 ft wide.

Who owns I 93 SB over HWY W Fourth ST?

It is owned by the State Highway Agency.