US Bridges

I 93 NB over RR Mbta/Bmrr

Fair

Middlesex County, Massachusetts · .6 KM Nly Rt 129 · Structure no. W380282HRDOTNBI

Built
1958
67 years old, rebuilt 1972
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
1 main span
Daily traffic
57,950
2024 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 1958 and reconstructed in 1972, so it is 67 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 57,950 vehicles a day, roughly 10% of them trucks, projected to reach 106,129 by 2033. The structure is 95 ft (29 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 93 NB
CrossesRR Mbta/Bmrr
Location.6 KM Nly Rt 129
RouteInterstate 93
CountyMiddlesex County
StateMassachusetts
Coordinates42.54118, -71.13482
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.
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 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating39.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span88 ft (26.8 m)
Deck width74 ft (22.6 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57,950 (2024)
Projected traffic106,129 by 2033
Trucks10%
Lanes on structure5
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$6.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1972.

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 57,950 vehicles per day (2024 count), of which roughly 10% are trucks.

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

The structure is 95 ft (29 m) long with a longest span of 88 ft (26.8 m) and a deck 74 ft wide.

Who owns I 93 NB over RR Mbta/Bmrr?

It is owned by the State Highway Agency.