US Bridges

HWY Washingtn ST over Comb I 90 & Amtrak/Mbta

Fair

Suffolk County, Massachusetts · .16 KM W. I 93 S71 · Structure no. B160794TGDOTNBI

Built
1965
60 years old
Condition
Fair
inspected October 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
196 ft
4 main spans
Daily traffic
12,000
2019 count
Owner
State
State Highway Agency

About this bridge

HWY Washingtn ST over Comb I 90 & Amtrak/Mbta is a steel stringer/multi-beam or girder carrying HWY Washingtn ST over Comb I 90 & Amtrak/Mbta in Suffolk County, Massachusetts. It was built in 1965, so it is 60 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 12,000 vehicles a day, roughly 10% of them trucks, projected to reach 14,056 by 2031. The structure is 196 ft (59.7 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Washingtn ST
CrossesComb I 90 & Amtrak/Mbta
Location.16 KM W. I 93 S71
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.34703, -71.06444
Functional classUrban Other Principal Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2021
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.3 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length196 ft (59.7 m)
Longest span55 ft (16.8 m)
Deck width66 ft (20.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2019)
Projected traffic14,056 by 2031
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Washingtn ST over Comb I 90 & Amtrak/Mbta built?

It was built in 1965, making it 60 years old in 2025.

What condition is HWY Washingtn ST over Comb I 90 & Amtrak/Mbta 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 October 2021.

How much traffic does HWY Washingtn ST over Comb I 90 & Amtrak/Mbta carry?

About 12,000 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is HWY Washingtn ST over Comb I 90 & Amtrak/Mbta?

The structure is 196 ft (59.7 m) long with a longest span of 55 ft (16.8 m) and a deck 66 ft wide.

Who owns HWY Washingtn ST over Comb I 90 & Amtrak/Mbta?

It is owned by the State Highway Agency.