US Bridges

I 93 NB over RR Mbta/Bmrr

Fair

Middlesex County, Massachusetts · 0.8 MI N of ST-125 · Structure no. W380362HXDOTNBI

Built
1959
66 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
1 main span
Daily traffic
73,300
2016 count
Owner
State
State Highway Agency

About this bridge

I 93 NB over RR Mbta/Bmrr is a steel stringer/multi-beam or girder carrying I 93 NB 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 73,300 vehicles a day, roughly 10% of them trucks, projected to reach 115,763 by 2033. The structure is 76 ft (23.2 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 NB
CrossesRR Mbta/Bmrr
Location0.8 MI N of ST-125
RouteInterstate 93
CountyMiddlesex County
StateMassachusetts
Coordinates42.59353, -71.16621
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span72 ft (21.9 m)
Deck width69 ft (21.1 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73,300 (2016)
Projected traffic115,763 by 2033
Trucks10%
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$5.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

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

What condition is I 93 NB 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 NB over RR Mbta/Bmrr carry?

About 73,300 vehicles per day (2016 count), of which roughly 10% are trucks.

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

The structure is 76 ft (23.2 m) long with a longest span of 72 ft (21.9 m) and a deck 69 ft wide.

Who owns I 93 NB over RR Mbta/Bmrr?

It is owned by the State Highway Agency.