US Bridges

HWY Carlton ST over Comb I 90 & Csx/Mbta

Fair

Norfolk County, Massachusetts · At Storrow Drive S48A · Structure no. B270184RCDOTNBI

Built
1965
60 years old, rebuilt 1994
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
202 ft
3 main spans
Daily traffic
29,741
2024 count
Owner
State
State Highway Agency

About this bridge

HWY Carlton ST over Comb I 90 & Csx/Mbta is a steel stringer/multi-beam or girder carrying HWY Carlton ST over Comb I 90 & Csx/Mbta in Norfolk County, Massachusetts. It was built in 1965 and reconstructed in 1994, so it is 60 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 29,741 vehicles a day, roughly 2% of them trucks, projected to reach 32,060 by 2031. The structure is 202 ft (61.6 m) long and 65 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHWY Carlton ST
CrossesComb I 90 & Csx/Mbta
LocationAt Storrow Drive S48A
RouteCity Street 0
CountyNorfolk County
StateMassachusetts
Coordinates42.34961, -71.1093
Functional classUrban Other Principal 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 inspectionAugust 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating49.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span73 ft (22.3 m)
Deck width65 ft (19.9 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,741 (2024)
Projected traffic32,060 by 2031
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.1 mi (5 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$12 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Carlton ST over Comb I 90 & Csx/Mbta built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1994.

What condition is HWY Carlton ST over Comb I 90 & Csx/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 August 2024.

How much traffic does HWY Carlton ST over Comb I 90 & Csx/Mbta carry?

About 29,741 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is HWY Carlton ST over Comb I 90 & Csx/Mbta?

The structure is 202 ft (61.6 m) long with a longest span of 73 ft (22.3 m) and a deck 65 ft wide.

Who owns HWY Carlton ST over Comb I 90 & Csx/Mbta?

It is owned by the State Highway Agency.