US Bridges

I 93 SB B10-B16 over RR Mbta/Bmrr

Fair

Suffolk County, Massachusetts · 1 MI N of JCT I93&US1 · Structure no. B162813EEDOTNBI

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Girder and Floorbeam System
Steel
Length
442 ft
6 main spans
Daily traffic
57,435
2022 count
Owner
State
State Highway Agency

About this bridge

I 93 SB B10-B16 over RR Mbta/Bmrr is a steel girder and floorbeam system carrying I 93 SB B10-B16 over RR Mbta/Bmrr in Suffolk County, Massachusetts. It was built in 1970, so it is 55 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 57,435 vehicles a day, roughly 9% of them trucks, projected to reach 108,498 by 2032. The structure is 442 ft (134.7 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 93 SB B10-B16
CrossesRR Mbta/Bmrr
Location1 MI N of JCT I93&US1
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.38236, -71.07661
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
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 alignment7: Better than present minimum criteria
Operating rating55.6 US tons
Inventory rating33.3 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length442 ft (134.7 m)
Longest span76 ft (23.2 m)
Deck width57 ft (17.4 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic57,435 (2022)
Projected traffic108,498 by 2032
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$22.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 SB B10-B16 over RR Mbta/Bmrr built?

It was built in 1970, making it 55 years old in 2025.

What condition is I 93 SB B10-B16 over RR Mbta/Bmrr 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 July 2023.

How much traffic does I 93 SB B10-B16 over RR Mbta/Bmrr carry?

About 57,435 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is I 93 SB B10-B16 over RR Mbta/Bmrr?

The structure is 442 ft (134.7 m) long with a longest span of 76 ft (23.2 m) and a deck 57 ft wide.

Who owns I 93 SB B10-B16 over RR Mbta/Bmrr?

It is owned by the State Highway Agency.