US Bridges

ST123 Belmont ST over ST 24

Good

Plymouth County, Massachusetts · .1 MI W of Va Hospital · Structure no. B250483V4DOTNBI

Built
1954
71 years old, rebuilt 2010
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
134 ft
2 main spans
Daily traffic
29,600
2024 count
Owner
State
State Highway Agency

About this bridge

ST123 Belmont ST over ST 24 is a steel continuous stringer/multi-beam or girder carrying ST123 Belmont ST over ST 24 in Plymouth County, Massachusetts. It was built in 1954 and reconstructed in 2010, so it is 71 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 29,600 vehicles a day, roughly 5% of them trucks, projected to reach 73,595 by 2031. The structure is 134 ft (40.7 m) long and 74 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesST123 Belmont ST
CrossesST 24
Location.1 MI W of Va Hospital
RouteState Highway 123
Coordinates42.06192, -71.06164
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating68.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length134 ft (40.7 m)
Longest span64 ft (19.5 m)
Deck width74 ft (22.6 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,600 (2024)
Projected traffic73,595 by 2031
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$4.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST123 Belmont ST over ST 24 built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2010.

What condition is ST123 Belmont ST over ST 24 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does ST123 Belmont ST over ST 24 carry?

About 29,600 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is ST123 Belmont ST over ST 24?

The structure is 134 ft (40.7 m) long with a longest span of 64 ft (19.5 m) and a deck 74 ft wide.

Who owns ST123 Belmont ST over ST 24?

It is owned by the State Highway Agency.