US Bridges

I 495 SB over RR Mbta/Bmrr

Good

Middlesex County, Massachusetts · 0.5 MI N of Rt 2 · Structure no. L1302327NDOTNBI

Built
1959
66 years old, rebuilt 2015
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
180 ft
3 main spans
Daily traffic
43,698
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over RR Mbta/Bmrr is a steel continuous stringer/multi-beam or girder carrying I 495 SB 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 43,698 vehicles a day, roughly 6% of them trucks, projected to reach 86,862 by 2031. The structure is 180 ft (54.9 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 495 SB
CrossesRR Mbta/Bmrr
Location0.5 MI N of Rt 2
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.52487, -71.50523
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
Deck7 GoodSome minor problems.
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 rating64.3 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length180 ft (54.9 m)
Longest span61 ft (18.6 m)
Deck width64 ft (19.4 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,698 (2023)
Projected traffic86,862 by 2031
Trucks6%
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 of existing bridge without deck rehabilitation
Estimated improvement cost$4.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB 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 SB 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 SB over RR Mbta/Bmrr carry?

About 43,698 vehicles per day (2023 count), of which roughly 6% are trucks.

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

The structure is 180 ft (54.9 m) long with a longest span of 61 ft (18.6 m) and a deck 64 ft wide.

Who owns I 495 SB over RR Mbta/Bmrr?

It is owned by the State Highway Agency.