US Bridges

I 495 NB over ST150

Fair

Essex County, Massachusetts · At Exit 54 · Structure no. A070232WADOTNBI

Built
1967
58 years old, rebuilt 1993
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
123 ft
3 main spans
Daily traffic
31,856
2016 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over ST150 is a steel stringer/multi-beam or girder carrying I 495 NB over ST150 in Essex County, Massachusetts. It was built in 1967 and reconstructed in 1993, so it is 58 years old, younger 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 31,856 vehicles a day, roughly 10% of them trucks, projected to reach 92,217 by 2032. The structure is 123 ft (37.5 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 495 NB
CrossesST150
LocationAt Exit 54
RouteInterstate 495
CountyEssex County
StateMassachusetts
Coordinates42.8395, -70.93653
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionOctober 2023
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 alignment7: Better than present minimum criteria
Operating rating55.8 US tons
Inventory rating33.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length123 ft (37.5 m)
Longest span59 ft (18 m)
Deck width58 ft (17.7 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,856 (2016)
Projected traffic92,217 by 2032
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 495 NB over ST150 built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1993.

What condition is I 495 NB over ST150 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 October 2023.

How much traffic does I 495 NB over ST150 carry?

About 31,856 vehicles per day (2016 count), of which roughly 10% are trucks.

How long is I 495 NB over ST150?

The structure is 123 ft (37.5 m) long with a longest span of 59 ft (18 m) and a deck 58 ft wide.

Who owns I 495 NB over ST150?

It is owned by the State Highway Agency.