US Bridges

I 93 SB over RR Mbta/Bmrr

Fair

Middlesex County, Massachusetts · 0.8 MI Nly Rt 125 · Structure no. W380372HYDOTNBI

Built
1959
66 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
71,877
2024 count
Owner
State
State Highway Agency

About this bridge

I 93 SB over RR Mbta/Bmrr is a steel stringer/multi-beam or girder carrying I 93 SB over RR Mbta/Bmrr in Middlesex County, Massachusetts. It was built in 1959, so it is 66 years old, older 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 71,877 vehicles a day, roughly 11% of them trucks, projected to reach 115,763 by 2033. The structure is 70 ft (21.3 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 93 SB
CrossesRR Mbta/Bmrr
Location0.8 MI Nly Rt 125
RouteInterstate 93
CountyMiddlesex County
StateMassachusetts
Coordinates42.59242, -71.16645
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
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 rating77.2 US tons
Inventory rating47.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span66 ft (20.1 m)
Deck width69 ft (21.1 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71,877 (2024)
Projected traffic115,763 by 2033
Trucks11%
Lanes on structure4
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$4.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1959, making it 66 years old in 2025.

What condition is I 93 SB 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 March 2024.

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

About 71,877 vehicles per day (2024 count), of which roughly 11% are trucks.

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

The structure is 70 ft (21.3 m) long with a longest span of 66 ft (20.1 m) and a deck 69 ft wide.

Who owns I 93 SB over RR Mbta/Bmrr?

It is owned by the State Highway Agency.