US Bridges

I 93 SB over Comb Austin ST &orng LN

Fair

Suffolk County, Massachusetts · I93/US1 Interchange · Structure no. B166018YVDOTNBI

Built
2003
22 years old
Condition
Fair
inspected September 2022
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
533 ft
4 main spans
Daily traffic
55,751
2021 count
Owner
State
State Highway Agency

About this bridge

I 93 SB over Comb Austin ST &orng LN is a steel continuous box beam or girders - multiple carrying I 93 SB over Comb Austin ST &orng LN in Suffolk County, Massachusetts. It was built in 2003, so it is 22 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 55,751 vehicles a day, roughly 9% of them trucks, projected to reach 113,826 by 2031. The structure is 533 ft (162.5 m) long and 66 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesI 93 SB
CrossesComb Austin ST &orng LN
LocationI93/US1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37328, -71.06967
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating109 US tons
Inventory rating65.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length533 ft (162.5 m)
Longest span148 ft (45.1 m)
Deck width66 ft (20.1 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic55,751 (2021)
Projected traffic113,826 by 2031
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed2.5 mi (4 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 statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$6.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 SB over Comb Austin ST &orng LN built?

It was built in 2003, making it 22 years old in 2025.

What condition is I 93 SB over Comb Austin ST &orng LN 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 September 2022.

How much traffic does I 93 SB over Comb Austin ST &orng LN carry?

About 55,751 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is I 93 SB over Comb Austin ST &orng LN?

The structure is 533 ft (162.5 m) long with a longest span of 148 ft (45.1 m) and a deck 66 ft wide.

Who owns I 93 SB over Comb Austin ST &orng LN?

It is owned by the State Highway Agency.