US Bridges

HWY Market ST over Comb I 90 & Mbta/Csx

Fair

Suffolk County, Massachusetts · .32 KM S. Charles Rv S41 · Structure no. B160594TTDOTNBI

Built
1964
61 years old, rebuilt 2001
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
187 ft
3 main spans
Daily traffic
28,100
2025 count
Owner
State
State Highway Agency

About this bridge

HWY Market ST over Comb I 90 & Mbta/Csx is a steel stringer/multi-beam or girder carrying HWY Market ST over Comb I 90 & Mbta/Csx in Suffolk County, Massachusetts. It was built in 1964 and reconstructed in 2001, so it is 61 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 6 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 28,100 vehicles a day, roughly 3% of them trucks, projected to reach 31,428 by 2032. The structure is 187 ft (57 m) long and 72 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHWY Market ST
CrossesComb I 90 & Mbta/Csx
Location.32 KM S. Charles Rv S41
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.35818, -71.14792
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating43.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length187 ft (57 m)
Longest span66 ft (20.1 m)
Deck width72 ft (22 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,100 (2025)
Projected traffic31,428 by 2032
Trucks3%
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 SystemNo
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$7.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2001.

What condition is HWY Market ST over Comb I 90 & 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 February 2025.

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

About 28,100 vehicles per day (2025 count), of which roughly 3% are trucks.

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

The structure is 187 ft (57 m) long with a longest span of 66 ft (20.1 m) and a deck 72 ft wide.

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

It is owned by the State Highway Agency.