US Bridges

ST123 Belmont ST over Water Salisbury Brook

Fair

Plymouth County, Massachusetts · W of Warr Ave JCT · Structure no. B25013431MUNNBI

Built
1850
175 years old, rebuilt 1924
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
20,043
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

ST123 Belmont ST over Water Salisbury Brook is a concrete slab carrying ST123 Belmont ST over Water Salisbury Brook in Plymouth County, Massachusetts. It was built in 1850 and reconstructed in 1924, so it is 175 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 20,043 vehicles a day, roughly 4% of them trucks, projected to reach 44,536 by 2031. The structure is 27 ft (8.2 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST123 Belmont ST
CrossesWater Salisbury Brook
LocationW of Warr Ave JCT
RouteCity Street 123
CountyPlymouth County
StateMassachusetts
Coordinates42.08, -71.02314
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.3 US tons
Inventory rating26.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width50 ft (15.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,043 (2024)
Projected traffic44,536 by 2031
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$1.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST123 Belmont ST over Water Salisbury Brook built?

It was built in 1850, making it 175 years old in 2025. It was reconstructed in 1924.

What condition is ST123 Belmont ST over Water Salisbury Brook 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 May 2024.

How much traffic does ST123 Belmont ST over Water Salisbury Brook carry?

About 20,043 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is ST123 Belmont ST over Water Salisbury Brook?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 50 ft wide.

Who owns ST123 Belmont ST over Water Salisbury Brook?

It is owned by the City or Municipal Highway Agency.