US Bridges

HWY Boylston ST over Comb Amtrak/Mbta & Orng

Fair

Suffolk County, Massachusetts · At Stony Brook Substation · Structure no. B160974VEMBTNBI

Built
1981
44 years old
Condition
Fair
inspected September 2022
Type
Frame
Concrete Continuous
Length
108 ft
2 main spans
Daily traffic
3,500
2022 count
Owner
State
Other State Agency

About this bridge

HWY Boylston ST over Comb Amtrak/Mbta & Orng is a concrete continuous frame carrying HWY Boylston ST over Comb Amtrak/Mbta & Orng in Suffolk County, Massachusetts. It was built in 1981, so it is 44 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 3,500 vehicles a day, roughly 7% of them trucks, projected to reach 5,212 by 2032. The structure is 108 ft (32.9 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Boylston ST
CrossesComb Amtrak/Mbta & Orng
LocationAt Stony Brook Substation
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.31703, -71.10431
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating75.4 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span62 ft (18.9 m)
Deck width56 ft (17.1 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2022)
Projected traffic5,212 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State Agency
Maintained byOther State Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Boylston ST over Comb Amtrak/Mbta & Orng built?

It was built in 1981, making it 44 years old in 2025.

What condition is HWY Boylston ST over Comb Amtrak/Mbta & Orng 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 2022.

How much traffic does HWY Boylston ST over Comb Amtrak/Mbta & Orng carry?

About 3,500 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is HWY Boylston ST over Comb Amtrak/Mbta & Orng?

The structure is 108 ft (32.9 m) long with a longest span of 62 ft (18.9 m) and a deck 56 ft wide.

Who owns HWY Boylston ST over Comb Amtrak/Mbta & Orng?

It is owned by the Other State Agency.