US Bridges

I 495 NB over RR Mbta/Bmrr

Good

Middlesex County, Massachusetts · 0.5 MI NE Rt 2 · Structure no. L1302327MDOTNBI

Built
1959
66 years old, rebuilt 2015
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
177 ft
3 main spans
Daily traffic
47,280
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over RR Mbta/Bmrr is a steel continuous stringer/multi-beam or girder carrying I 495 NB over RR Mbta/Bmrr in Middlesex County, Massachusetts. It was built in 1959 and reconstructed in 2015, 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 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 47,280 vehicles a day, roughly 15% of them trucks, projected to reach 86,862 by 2031. The structure is 177 ft (54 m) long and 62 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI 495 NB
CrossesRR Mbta/Bmrr
Location0.5 MI NE Rt 2
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.52438, -71.50495
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than 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 rating75 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length177 ft (54 m)
Longest span61 ft (18.5 m)
Deck width62 ft (19 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,280 (2023)
Projected traffic86,862 by 2031
Trucks15%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 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 of existing bridge without deck rehabilitation
Estimated improvement cost$5.3 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 NB over RR Mbta/Bmrr built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2015.

What condition is I 495 NB over RR Mbta/Bmrr 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 July 2023.

How much traffic does I 495 NB over RR Mbta/Bmrr carry?

About 47,280 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I 495 NB over RR Mbta/Bmrr?

The structure is 177 ft (54 m) long with a longest span of 61 ft (18.5 m) and a deck 62 ft wide.

Who owns I 495 NB over RR Mbta/Bmrr?

It is owned by the State Highway Agency.