US Bridges

I 495 SB over RR Mbta/Csx

Fair

Norfolk County, Massachusetts · .2 MI SE of ST 140 · Structure no. F080271VFDOTNBI

Built
1966
59 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
35,535
2024 count
Owner
State
State Highway Agency

About this bridge

I 495 SB over RR Mbta/Csx is a prestressed concrete slab carrying I 495 SB over RR Mbta/Csx in Norfolk County, Massachusetts. It was built in 1966, so it is 59 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 35,535 vehicles a day, roughly 7% of them trucks, projected to reach 63,172 by 2031. The structure is 42 ft (12.8 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 495 SB
CrossesRR Mbta/Csx
Location.2 MI SE of ST 140
RouteInterstate 495
CountyNorfolk County
StateMassachusetts
Coordinates42.08748, -71.42537
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJuly 2024
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 alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating36.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,535 (2024)
Projected traffic63,172 by 2031
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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$2.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 SB over RR Mbta/Csx built?

It was built in 1966, making it 59 years old in 2025.

What condition is I 495 SB over RR Mbta/Csx 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 July 2024.

How much traffic does I 495 SB over RR Mbta/Csx carry?

About 35,535 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is I 495 SB over RR Mbta/Csx?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 55 ft wide.

Who owns I 495 SB over RR Mbta/Csx?

It is owned by the State Highway Agency.