US Bridges

I 93 SB over Comb Millers River/ Oth

Fair

Suffolk County, Massachusetts · I93/US 1 Interchange · Structure no. B166018YWDOTNBI

Built
2002
23 years old
Condition
Fair
inspected January 2022
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
834 ft
6 main spans
Daily traffic
80,170
2020 count
Owner
State
State Highway Agency

About this bridge

I 93 SB over Comb Millers River/ Oth is a prestressed concrete continuous segmental box girder carrying I 93 SB over Comb Millers River/ Oth in Suffolk County, Massachusetts. It was built in 2002, so it is 23 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 80,170 vehicles a day, roughly 8% of them trucks, projected to reach 275,793 by 2031. The structure is 834 ft (254.2 m) long and 66 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesI 93 SB
CrossesComb Millers River/ Oth
LocationI93/US 1 Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37243, -71.06824
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2022
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating51.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans6
Design loadHS 25 or greater
Structure length834 ft (254.2 m)
Longest span147 ft (44.8 m)
Deck width66 ft (20.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deck14 ft (4.4 m)

Traffic and service

Average daily traffic80,170 (2020)
Projected traffic275,793 by 2031
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$49.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 SB over Comb Millers River/ Oth built?

It was built in 2002, making it 23 years old in 2025.

What condition is I 93 SB over Comb Millers River/ Oth 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 January 2022.

How much traffic does I 93 SB over Comb Millers River/ Oth carry?

About 80,170 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is I 93 SB over Comb Millers River/ Oth?

The structure is 834 ft (254.2 m) long with a longest span of 147 ft (44.8 m) and a deck 66 ft wide.

Who owns I 93 SB over Comb Millers River/ Oth?

It is owned by the State Highway Agency.