US Bridges

ST 18 Bedford ST over RR Mbta/Csx

Fair

Plymouth County, Massachusetts · CSX MP Qnb 19.56 · Structure no. L0100547FDOTNBI

Built
1931
94 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
110 ft
3 main spans
Daily traffic
16,143
2023 count
Owner
State
State Highway Agency

About this bridge

ST 18 Bedford ST over RR Mbta/Csx is a steel stringer/multi-beam or girder carrying ST 18 Bedford ST over RR Mbta/Csx in Plymouth County, Massachusetts. It was built in 1931, so it is 94 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 16,143 vehicles a day, roughly 7% of them trucks, projected to reach 25,111 by 2032. The structure is 110 ft (33.5 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST 18 Bedford ST
CrossesRR Mbta/Csx
LocationCSX MP Qnb 19.56
RouteState Highway 18
CountyPlymouth County
StateMassachusetts
Coordinates41.88673, -70.95597
Functional classUrban Minor 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length110 ft (33.5 m)
Longest span36 ft (11 m)
Deck width49 ft (14.9 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,143 (2023)
Projected traffic25,111 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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$4.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 18 Bedford ST over RR Mbta/Csx built?

It was built in 1931, making it 94 years old in 2025.

What condition is ST 18 Bedford ST over RR Mbta/Csx 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 2023.

How much traffic does ST 18 Bedford ST over RR Mbta/Csx carry?

About 16,143 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is ST 18 Bedford ST over RR Mbta/Csx?

The structure is 110 ft (33.5 m) long with a longest span of 36 ft (11 m) and a deck 49 ft wide.

Who owns ST 18 Bedford ST over RR Mbta/Csx?

It is owned by the State Highway Agency.