US Bridges

I 495 NB over HWY Boston RD

Poor

Middlesex County, Massachusetts · Exit 83/N of 110 · Structure no. W2601927UDOTNBI

Built
1959
66 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
127 ft
3 main spans
Daily traffic
53,253
2021 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over HWY Boston RD is a steel stringer/multi-beam or girder carrying I 495 NB over HWY Boston RD 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 53,253 vehicles a day, roughly 7% of them trucks, projected to reach 86,862 by 2031. The structure is 127 ft (38.7 m) long and 57 ft wide.

Location

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CarriesI 495 NB
CrossesHWY Boston RD
LocationExit 83/N of 110
RouteInterstate 495
CountyMiddlesex County
StateMassachusetts
Coordinates42.56904, -71.4257
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be 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 rating68.9 US tons
Inventory rating41.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length127 ft (38.7 m)
Longest span55 ft (16.8 m)
Deck width57 ft (17.4 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53,253 (2021)
Projected traffic86,862 by 2031
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 495 NB over HWY Boston RD built?

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

What condition is I 495 NB over HWY Boston RD in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does I 495 NB over HWY Boston RD carry?

About 53,253 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I 495 NB over HWY Boston RD?

The structure is 127 ft (38.7 m) long with a longest span of 55 ft (16.8 m) and a deck 57 ft wide.

Who owns I 495 NB over HWY Boston RD?

It is owned by the State Highway Agency.