US Bridges

HWY Prospect ST over RR Mbta/Bmrr

Fair

Middlesex County, Massachusetts · 1.5 MI N of Harvard Br. · Structure no. S170203GBDOT634

Built
1933
92 years old, rebuilt 1984
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
14,900
2018 count
Owner
State
State Highway Agency

About this bridge

HWY Prospect ST over RR Mbta/Bmrr is a prestressed concrete box beam or girders - multiple carrying HWY Prospect ST over RR Mbta/Bmrr in Middlesex County, Massachusetts. It was built in 1933 and reconstructed in 1984, so it is 92 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 14,900 vehicles a day, roughly 11% of them trucks, projected to reach 32,534 by 2033. The structure is 40 ft (12.2 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY Prospect ST
CrossesRR Mbta/Bmrr
Location1.5 MI N of Harvard Br.
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.37747, -71.09522
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 geometry6: Equal to present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating85.3 US tons
Inventory rating50 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width49 ft (14.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,900 (2018)
Projected traffic32,534 by 2033
Trucks11%
Lanes on structure2
Traffic directionOne-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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Prospect ST over RR Mbta/Bmrr built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1984.

What condition is HWY Prospect 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 HWY Prospect ST over RR Mbta/Bmrr carry?

About 14,900 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is HWY Prospect ST over RR Mbta/Bmrr?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 49 ft wide.

Who owns HWY Prospect ST over RR Mbta/Bmrr?

It is owned by the State Highway Agency.