US Bridges

HWY Blakemore ST over RR Amtrak/Mbta

Fair

Suffolk County, Massachusetts · 3.8 W of Rt 93 · Structure no. B16105390MUNNBI

Built
1882
143 years old, rebuilt 1950
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Steel
Length
75 ft
1 main span
Daily traffic
6,518
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY Blakemore ST over RR Amtrak/Mbta is a steel girder and floorbeam system carrying HWY Blakemore ST over RR Amtrak/Mbta in Suffolk County, Massachusetts. It was built in 1882 and reconstructed in 1950, so it is 143 years old, older 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 6,518 vehicles a day, roughly 5% of them trucks, projected to reach 15,635 by 2032. The structure is 75 ft (22.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Blakemore ST
CrossesRR Amtrak/Mbta
Location3.8 W of Rt 93
RouteCity Street 0
CountySuffolk County
StateMassachusetts
Coordinates42.28549, -71.11955
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating74.4 US tons
Inventory rating44.5 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length75 ft (22.9 m)
Longest span71 ft (21.6 m)
Deck width41 ft (12.5 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,518 (2024)
Projected traffic15,635 by 2032
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1882, making it 143 years old in 2025. It was reconstructed in 1950.

What condition is HWY Blakemore ST over RR 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 2024.

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

About 6,518 vehicles per day (2024 count), of which roughly 5% are trucks.

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

The structure is 75 ft (22.9 m) long with a longest span of 71 ft (21.6 m) and a deck 41 ft wide.

Who owns HWY Blakemore ST over RR Amtrak/Mbta?

It is owned by the City or Municipal Highway Agency.