US Bridges

HWY Canterbry ST over RR Amtrak/Mbta

PoorPosted for load

Suffolk County, Massachusetts · 2.3 KM NW OFJCTSR28&SR138 · Structure no. B161073HADOT634

Built
1985
40 years old
Condition
Poor
inspected June 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
16,034
2018 count
Owner
State
State Highway Agency

About this bridge

HWY Canterbry ST over RR Amtrak/Mbta is a prestressed concrete box beam or girders - multiple carrying HWY Canterbry ST over RR Amtrak/Mbta in Suffolk County, Massachusetts. It was built in 1985, so it is 40 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. Its operating status is: posted for load restriction.

It carries about 16,034 vehicles a day, roughly 5% of them trucks, projected to reach 40,904 by 2031. The structure is 71 ft (21.6 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHWY Canterbry ST
CrossesRR Amtrak/Mbta
Location2.3 KM NW OFJCTSR28&SR138
RouteCity Street 0
Coordinates42.27882, -71.12001
Functional classUrban Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2022
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating14.3 US tons
Inventory rating8.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span65 ft (19.8 m)
Deck width49 ft (14.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,034 (2018)
Projected traffic40,904 by 2031
Trucks5%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Canterbry ST over RR Amtrak/Mbta built?

It was built in 1985, making it 40 years old in 2025.

What condition is HWY Canterbry ST over RR Amtrak/Mbta 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 June 2022.

How much traffic does HWY Canterbry ST over RR Amtrak/Mbta carry?

About 16,034 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is HWY Canterbry ST over RR Amtrak/Mbta?

The structure is 71 ft (21.6 m) long with a longest span of 65 ft (19.8 m) and a deck 49 ft wide.

Who owns HWY Canterbry ST over RR Amtrak/Mbta?

It is owned by the State Highway Agency.