US Bridges

I 93 NB/US1NB over ST 24 SB

Fair

Norfolk County, Massachusetts · I 93 at ST 24 · Structure no. R0100735ADOTNBI

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
83,800
2024 count
Owner
State
State Highway Agency

About this bridge

I 93 NB/US1NB over ST 24 SB is a steel stringer/multi-beam or girder carrying I 93 NB/US1NB over ST 24 SB in Norfolk County, Massachusetts. It was built in 1958, so it is 67 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 83,800 vehicles a day, roughly 8% of them trucks, projected to reach 309,543 by 2031. The structure is 85 ft (25.9 m) long and 58 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI 93 NB/US1NB
CrossesST 24 SB
LocationI 93 at ST 24
RouteInterstate 93
CountyNorfolk County
StateMassachusetts
Coordinates42.20267, -71.07811
Functional classUrban Principal Arterial - Interstate

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating29.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span79 ft (24.1 m)
Deck width58 ft (17.7 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83,800 (2024)
Projected traffic309,543 by 2031
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$4.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 93 NB/US1NB over ST 24 SB built?

It was built in 1958, making it 67 years old in 2025.

What condition is I 93 NB/US1NB over ST 24 SB 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 November 2024.

How much traffic does I 93 NB/US1NB over ST 24 SB carry?

About 83,800 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is I 93 NB/US1NB over ST 24 SB?

The structure is 85 ft (25.9 m) long with a longest span of 79 ft (24.1 m) and a deck 58 ft wide.

Who owns I 93 NB/US1NB over ST 24 SB?

It is owned by the State Highway Agency.