US Bridges

I 93 SB over Comb Ramp Lt& Millers R

Fair

Suffolk County, Massachusetts · I93/US Interchange · Structure no. B166018YXDOTNBI

Built
2002
23 years old
Condition
Fair
inspected March 2022
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
715 ft
5 main spans
Daily traffic
97,000
2019 count
Owner
State
State Highway Agency

About this bridge

I 93 SB over Comb Ramp Lt& Millers R is a prestressed concrete continuous segmental box girder carrying I 93 SB over Comb Ramp Lt& Millers R 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 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 97,000 vehicles a day, roughly 8% of them trucks, projected to reach 63,172 by 2031. The structure is 715 ft (217.8 m) long and 67 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesI 93 SB
CrossesComb Ramp Lt& Millers R
LocationI93/US Interchange
RouteInterstate 93
CountySuffolk County
StateMassachusetts
Coordinates42.37026, -71.06521
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating92.8 US tons
Inventory rating53.6 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans5
Design loadHS 25 or greater
Structure length715 ft (217.8 m)
Longest span143 ft (43.6 m)
Deck width67 ft (20.4 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic97,000 (2019)
Projected traffic63,172 by 2031
Trucks8%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$33.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 SB over Comb Ramp Lt& Millers R built?

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

What condition is I 93 SB over Comb Ramp Lt& Millers R 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 March 2022.

How much traffic does I 93 SB over Comb Ramp Lt& Millers R carry?

About 97,000 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is I 93 SB over Comb Ramp Lt& Millers R?

The structure is 715 ft (217.8 m) long with a longest span of 143 ft (43.6 m) and a deck 67 ft wide.

Who owns I 93 SB over Comb Ramp Lt& Millers R?

It is owned by the State Highway Agency.