US Bridges

I 495 NB over Comb Forbs//Amtrak/Mbta

Fair

Bristol County, Massachusetts · 1.9 MI E of I 95 · Structure no. M030343RGDOTNBI

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
183 ft
2 main spans
Daily traffic
37,280
2021 count
Owner
State
State Highway Agency

About this bridge

I 495 NB over Comb Forbs//Amtrak/Mbta is a prestressed concrete stringer/multi-beam or girder carrying I 495 NB over Comb Forbs//Amtrak/Mbta in Bristol County, Massachusetts. It was built in 1978, so it is 47 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 37,280 vehicles a day, roughly 5% of them trucks, projected to reach 63,172 by 2032. The structure is 183 ft (55.8 m) long and 58 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI 495 NB
CrossesComb Forbs//Amtrak/Mbta
Location1.9 MI E of I 95
RouteInterstate 495
CountyBristol County
StateMassachusetts
Coordinates42.01328, -71.2339
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 inspectionFebruary 2023
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 rating63.1 US tons
Inventory rating48.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length183 ft (55.8 m)
Longest span96 ft (29.3 m)
Deck width58 ft (17.6 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,280 (2021)
Projected traffic63,172 by 2032
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed3.7 mi (6 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$9.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 NB over Comb Forbs//Amtrak/Mbta built?

It was built in 1978, making it 47 years old in 2025.

What condition is I 495 NB over Comb Forbs//Amtrak/Mbta 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 2023.

How much traffic does I 495 NB over Comb Forbs//Amtrak/Mbta carry?

About 37,280 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is I 495 NB over Comb Forbs//Amtrak/Mbta?

The structure is 183 ft (55.8 m) long with a longest span of 96 ft (29.3 m) and a deck 58 ft wide.

Who owns I 495 NB over Comb Forbs//Amtrak/Mbta?

It is owned by the State Highway Agency.