US Bridges

I 495 NB over RR Mbta/Csx

Poor

Norfolk County, Massachusetts · .2 MI S of Exit 43/RT140 · Structure no. F080271VEDOTNBI

Built
1966
59 years old
Condition
Poor
inspected July 2024
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
40,744
2021 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over RR Mbta/Csx is a prestressed concrete slab carrying I 495 NB 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 40,744 vehicles a day, roughly 7% of them trucks, projected to reach 56,855 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 NB
CrossesRR Mbta/Csx
Location.2 MI S of Exit 43/RT140
RouteInterstate 495
CountyNorfolk County
StateMassachusetts
Coordinates42.08744, -71.42478
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.7 US tons
Inventory rating28 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 traffic40,744 (2021)
Projected traffic56,855 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

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

What condition is I 495 NB over RR Mbta/Csx in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

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

About 40,744 vehicles per day (2021 count), of which roughly 7% are trucks.

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

It is owned by the State Highway Agency.