US Bridges

I 495 SB over ST 24 SB

Fair

Plymouth County, Massachusetts · I 495 at ST 24 · Structure no. B230223T4DOTNBI

Built
1979
46 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
157 ft
1 main span
Daily traffic
42,987
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over ST 24 SB is a steel stringer/multi-beam or girder carrying I 495 SB 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 6 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 42,987 vehicles a day, roughly 11% of them trucks, projected to reach 55,276 by 2032. The structure is 157 ft (47.9 m) long and 59 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI 495 SB
CrossesST 24 SB
LocationI 495 at ST 24
RouteInterstate 495
CountyPlymouth County
StateMassachusetts
Coordinates41.94851, -71.02363
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment9: Superior to present desirable criteria
Operating rating81.7 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span150 ft (45.7 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,987 (2023)
Projected traffic55,276 by 2032
Trucks11%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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$5.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB over ST 24 SB built?

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

What condition is I 495 SB 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 SB over ST 24 SB carry?

About 42,987 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I 495 SB over ST 24 SB?

The structure is 157 ft (47.9 m) long with a longest span of 150 ft (45.7 m) and a deck 59 ft wide.

Who owns I 495 SB over ST 24 SB?

It is owned by the State Highway Agency.