US Bridges

ST 27 Main ST over RR Mbta/Bmrr

Fair

Middlesex County, Massachusetts · 100 Ft S of School ST · Structure no. A0200429ADOT634

Built
1906
119 years old, rebuilt 1997
Condition
Fair
inspected January 2024
Type
Slab
Prestressed Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
9,069
2022 count
Owner
State
State Highway Agency

About this bridge

ST 27 Main ST over RR Mbta/Bmrr is a prestressed concrete continuous slab carrying ST 27 Main ST over RR Mbta/Bmrr in Middlesex County, Massachusetts. It was built in 1906 and reconstructed in 1997, so it is 119 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 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 9,069 vehicles a day, roughly 2% of them trucks, projected to reach 21,478 by 2033. The structure is 85 ft (26 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 27 Main ST
CrossesRR Mbta/Bmrr
Location100 Ft S of School ST
RouteState Highway 27
CountyMiddlesex County
StateMassachusetts
Coordinates42.46007, -71.45446
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.6 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length85 ft (26 m)
Longest span43 ft (13.1 m)
Deck width50 ft (15.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,069 (2022)
Projected traffic21,478 by 2033
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$4.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 27 Main ST over RR Mbta/Bmrr built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1997.

What condition is ST 27 Main ST over RR Mbta/Bmrr 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 January 2024.

How much traffic does ST 27 Main ST over RR Mbta/Bmrr carry?

About 9,069 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is ST 27 Main ST over RR Mbta/Bmrr?

The structure is 85 ft (26 m) long with a longest span of 43 ft (13.1 m) and a deck 50 ft wide.

Who owns ST 27 Main ST over RR Mbta/Bmrr?

It is owned by the State Highway Agency.