US Bridges

I 495 NB over ST 28 Nb/Union ST

Fair

Essex County, Massachusetts · 2.5 MI N I93 · Structure no. A090412XYDOTNBI

Built
1962
63 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
164 ft
3 main spans
Daily traffic
50,658
2024 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over ST 28 Nb/Union ST is a steel stringer/multi-beam or girder carrying I 495 NB over ST 28 Nb/Union ST in Essex County, Massachusetts. It was built in 1962, so it is 63 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 50,658 vehicles a day, roughly 7% of them trucks, projected to reach 77,149 by 2033. The structure is 164 ft (50 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 495 NB
CrossesST 28 Nb/Union ST
Location2.5 MI N I93
RouteInterstate 495
CountyEssex County
StateMassachusetts
Coordinates42.67906, -71.15201
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating46.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length164 ft (50 m)
Longest span53 ft (16.2 m)
Deck width60 ft (18.3 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,658 (2024)
Projected traffic77,149 by 2033
Trucks7%
Lanes on structure3
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$9.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 NB over ST 28 Nb/Union ST built?

It was built in 1962, making it 63 years old in 2025.

What condition is I 495 NB over ST 28 Nb/Union ST 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 495 NB over ST 28 Nb/Union ST carry?

About 50,658 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is I 495 NB over ST 28 Nb/Union ST?

The structure is 164 ft (50 m) long with a longest span of 53 ft (16.2 m) and a deck 60 ft wide.

Who owns I 495 NB over ST 28 Nb/Union ST?

It is owned by the State Highway Agency.