US Bridges

US 1 Ramp Lc over Comb US1SB/NB&MILLERS R

Fair

Suffolk County, Massachusetts · Ramp from Rutherford Ave · Structure no. B1639691WDOTNBI

Built
1989
36 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
735 ft
4 main spans
Daily traffic
21,724
2024 count
Owner
State
State Highway Agency

About this bridge

US 1 Ramp Lc over Comb US1SB/NB&MILLERS R is a steel continuous box beam or girders - multiple carrying US 1 Ramp Lc over Comb US1SB/NB&MILLERS R 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 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 21,724 vehicles a day, roughly 6% of them trucks. The structure is 735 ft (223.9 m) long and 65 ft wide.

Location

Open in Google Maps
CarriesUS 1 Ramp Lc
CrossesComb US1SB/NB&MILLERS R
LocationRamp from Rutherford Ave
CountySuffolk County
StateMassachusetts
Coordinates42.37056, -71.06456
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.1 US tons
Inventory rating37.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+2 approach)
Design loadHS 20
Structure length735 ft (223.9 m)
Longest span122 ft (37.3 m)
Deck width65 ft (19.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic21,724 (2024)
Projected traffic—
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
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$31.9 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 Ramp Lc over Comb US1SB/NB&MILLERS R built?

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

What condition is US 1 Ramp Lc over Comb US1SB/NB&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 September 2024.

How much traffic does US 1 Ramp Lc over Comb US1SB/NB&MILLERS R carry?

About 21,724 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is US 1 Ramp Lc over Comb US1SB/NB&MILLERS R?

The structure is 735 ft (223.9 m) long with a longest span of 122 ft (37.3 m) and a deck 65 ft wide.

Who owns US 1 Ramp Lc over Comb US1SB/NB&MILLERS R?

It is owned by the State Highway Agency.