US Bridges

I 495 over Comb ST105 & Mbta/Macrr

Fair

Plymouth County, Massachusetts · .25 MI W of RTE 28 · Structure no. M18017463DOTNBI

Built
1958
67 years old, rebuilt 1987
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
182 ft
4 main spans
Daily traffic
47,431
2023 count
Owner
State
State Highway Agency

About this bridge

I 495 over Comb ST105 & Mbta/Macrr is a steel stringer/multi-beam or girder carrying I 495 over Comb ST105 & Mbta/Macrr in Plymouth County, Massachusetts. It was built in 1958 and reconstructed in 1987, so it is 67 years old, older 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 47,431 vehicles a day, roughly 4% of them trucks, projected to reach 94,758 by 2032. The structure is 182 ft (55.5 m) long and 134 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI 495
CrossesComb ST105 & Mbta/Macrr
Location.25 MI W of RTE 28
RouteInterstate 495
CountyPlymouth County
StateMassachusetts
Coordinates41.88247, -70.92103
Functional classUrban Minor Arterial

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 inspectionOctober 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length182 ft (55.5 m)
Longest span59 ft (18 m)
Deck width134 ft (40.7 m)
Roadway width130 ft (39.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,431 (2023)
Projected traffic94,758 by 2032
Trucks4%
Lanes on structure6
Traffic directionTwo-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 statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$22.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 495 over Comb ST105 & Mbta/Macrr built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1987.

What condition is I 495 over Comb ST105 & Mbta/Macrr 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 October 2023.

How much traffic does I 495 over Comb ST105 & Mbta/Macrr carry?

About 47,431 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I 495 over Comb ST105 & Mbta/Macrr?

The structure is 182 ft (55.5 m) long with a longest span of 59 ft (18 m) and a deck 134 ft wide.

Who owns I 495 over Comb ST105 & Mbta/Macrr?

It is owned by the State Highway Agency.