US Bridges

I 90 WB over ST 1 A/Nb & RP1ANB

Good

Suffolk County, Massachusetts · Segment 2 · Structure no. B16588586DOTNBI

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
309 ft
2 main spans
Daily traffic
50,431
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 WB over ST 1 A/Nb & RP1ANB is a prestressed concrete continuous segmental box girder carrying I 90 WB over ST 1 A/Nb & RP1ANB 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 50,431 vehicles a day, roughly 8% of them trucks, projected to reach 17,576 by 2032. The structure is 309 ft (94.2 m) long and 61 ft wide.

Location

Open in Google Maps
CarriesI 90 WB
CrossesST 1 A/Nb & RP1ANB
LocationSegment 2
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.37543, -71.02954
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.
Last inspectionMay 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 rating63.5 US tons
Inventory rating49.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length309 ft (94.2 m)
Longest span158 ft (48.2 m)
Deck width61 ft (18.6 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic50,431 (2023)
Projected traffic17,576 by 2032
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a toll road
National Highway SystemYes

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$2.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 WB over ST 1 A/Nb & RP1ANB built?

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

What condition is I 90 WB over ST 1 A/Nb & RP1ANB 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 May 2023.

How much traffic does I 90 WB over ST 1 A/Nb & RP1ANB carry?

About 50,431 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is I 90 WB over ST 1 A/Nb & RP1ANB?

The structure is 309 ft (94.2 m) long with a longest span of 158 ft (48.2 m) and a deck 61 ft wide.

Who owns I 90 WB over ST 1 A/Nb & RP1ANB?

It is owned by the State Highway Agency.