US Bridges

ST 3 over HWY Union ST S Rotary

Fair

Norfolk County, Massachusetts · ST 3 at Union ST · Structure no. B2103434KDOTNBI

Built
1957
68 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
146 ft
3 main spans
Daily traffic
204,310
2024 count
Owner
State
State Highway Agency

About this bridge

ST 3 over HWY Union ST S Rotary is a steel stringer/multi-beam or girder carrying ST 3 over HWY Union ST S Rotary in Norfolk County, Massachusetts. It was built in 1957, so it is 68 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 204,310 vehicles a day, roughly 5% of them trucks, projected to reach 218,259 by 2031. The structure is 146 ft (44.5 m) long and 116 ft wide.

Location

Open in Google Maps
CarriesST 3
CrossesHWY Union ST S Rotary
LocationST 3 at Union ST
RouteState Highway 3
CountyNorfolk County
StateMassachusetts
Coordinates42.20919, -70.99618
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure7 GoodSome minor problems.
Last inspectionJuly 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 geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating90.1 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length146 ft (44.5 m)
Longest span63 ft (19.2 m)
Deck width116 ft (35.4 m)
Roadway width110 ft (33.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic204,310 (2024)
Projected traffic218,259 by 2031
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$15.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 3 over HWY Union ST S Rotary built?

It was built in 1957, making it 68 years old in 2025.

What condition is ST 3 over HWY Union ST S Rotary 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 July 2024.

How much traffic does ST 3 over HWY Union ST S Rotary carry?

About 204,310 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is ST 3 over HWY Union ST S Rotary?

The structure is 146 ft (44.5 m) long with a longest span of 63 ft (19.2 m) and a deck 116 ft wide.

Who owns ST 3 over HWY Union ST S Rotary?

It is owned by the State Highway Agency.