US Bridges

I 495 NB over ST 24 SB

Fair

Plymouth County, Massachusetts · I 495 at ST 24 · Structure no. B230213T5DOTNBI

Built
1979
46 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
1 main span
Daily traffic
59,612
2025 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over ST 24 SB is a steel stringer/multi-beam or girder carrying I 495 NB over ST 24 SB in Plymouth County, Massachusetts. It was built in 1979, so it is 46 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 59,612 vehicles a day, roughly 7% of them trucks, projected to reach 55,276 by 2032. The structure is 153 ft (46.5 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI 495 NB
CrossesST 24 SB
LocationI 495 at ST 24
RouteInterstate 495
CountyPlymouth County
StateMassachusetts
Coordinates41.94918, -71.02384
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
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 geometry6: Equal to present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating82.8 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length153 ft (46.5 m)
Longest span145 ft (44.2 m)
Deck width57 ft (17.4 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59,612 (2025)
Projected traffic55,276 by 2032
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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$8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 NB over ST 24 SB built?

It was built in 1979, making it 46 years old in 2025.

What condition is I 495 NB over ST 24 SB 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 February 2025.

How much traffic does I 495 NB over ST 24 SB carry?

About 59,612 vehicles per day (2025 count), of which roughly 7% are trucks.

How long is I 495 NB over ST 24 SB?

The structure is 153 ft (46.5 m) long with a longest span of 145 ft (44.2 m) and a deck 57 ft wide.

Who owns I 495 NB over ST 24 SB?

It is owned by the State Highway Agency.