US Bridges

US 1 Ramp Tc over Comb US1NB & Millers Ri

Good

Suffolk County, Massachusetts · North of Cana Tunnel · Structure no. B1639291RDOTNBI

Built
1989
36 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
538 ft
3 main spans
Daily traffic
42,672
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 Ramp Tc over Comb US1NB & Millers Ri is a steel continuous box beam or girders - multiple carrying US 1 Ramp Tc over Comb US1NB & Millers Ri in Suffolk County, Massachusetts. It was built in 1989, so it is 36 years old, younger than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 42,672 vehicles a day, roughly 7% of them trucks. The structure is 538 ft (164 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesUS 1 Ramp Tc
CrossesComb US1NB & Millers Ri
LocationNorth of Cana Tunnel
CountySuffolk County
StateMassachusetts
Coordinates42.37045, -71.06433
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating75.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length538 ft (164 m)
Longest span250 ft (76.2 m)
Deck width43 ft (13.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic42,672 (2024)
Projected traffic—
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
TollOn a toll 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$4.6 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 Ramp Tc over Comb US1NB & Millers Ri built?

It was built in 1989, making it 36 years old in 2025.

What condition is US 1 Ramp Tc over Comb US1NB & Millers Ri in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does US 1 Ramp Tc over Comb US1NB & Millers Ri carry?

About 42,672 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is US 1 Ramp Tc over Comb US1NB & Millers Ri?

The structure is 538 ft (164 m) long with a longest span of 250 ft (76.2 m) and a deck 43 ft wide.

Who owns US 1 Ramp Tc over Comb US1NB & Millers Ri?

It is owned by the State Highway Agency.