US Bridges

HWY Beacon ST over Comb I 90 & Mbta/Csx

Poor

Suffolk County, Massachusetts · .1MI.W.BROOKLINE Ave S50 · Structure no. B160544T2DOTNBI

Built
1965
60 years old, rebuilt 1993
Condition
Poor
inspected February 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
355 ft
3 main spans
Daily traffic
26,911
2018 count
Owner
State
State Highway Agency

About this bridge

HWY Beacon ST over Comb I 90 & Mbta/Csx is a steel stringer/multi-beam or girder carrying HWY Beacon ST over Comb I 90 & Mbta/Csx in Suffolk County, Massachusetts. It was built in 1965 and reconstructed in 1993, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 26,911 vehicles a day, roughly 8% of them trucks, projected to reach 17,214 by 2031. The structure is 355 ft (108.2 m) long and 102 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHWY Beacon ST
CrossesComb I 90 & Mbta/Csx
Location.1MI.W.BROOKLINE Ave S50
RouteInterstate 90
CountySuffolk County
StateMassachusetts
Coordinates42.34788, -71.10056
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2022
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length355 ft (108.2 m)
Longest span136 ft (41.5 m)
Deck width102 ft (31.2 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,911 (2018)
Projected traffic17,214 by 2031
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.1 mi (5 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$54.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Beacon ST over Comb I 90 & Mbta/Csx built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1993.

What condition is HWY Beacon ST over Comb I 90 & Mbta/Csx in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2022.

How much traffic does HWY Beacon ST over Comb I 90 & Mbta/Csx carry?

About 26,911 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is HWY Beacon ST over Comb I 90 & Mbta/Csx?

The structure is 355 ft (108.2 m) long with a longest span of 136 ft (41.5 m) and a deck 102 ft wide.

Who owns HWY Beacon ST over Comb I 90 & Mbta/Csx?

It is owned by the State Highway Agency.