US Bridges

ST 4 SB over US 3 Nb/Sb

Fair

Middlesex County, Massachusetts · 2.2 MI N of I 495 · Structure no. C0801985QDOTNBI

Built
2004
21 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
164 ft
2 main spans
Daily traffic
14,018
2018 count
Owner
State
State Highway Agency

About this bridge

ST 4 SB over US 3 Nb/Sb is a steel continuous stringer/multi-beam or girder carrying ST 4 SB over US 3 Nb/Sb in Middlesex County, Massachusetts. It was built in 2004, so it is 21 years old, younger 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 6 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 14,018 vehicles a day, roughly 7% of them trucks, projected to reach 23,058 by 2032. The structure is 164 ft (50 m) long and 70 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesST 4 SB
CrossesUS 3 Nb/Sb
Location2.2 MI N of I 495
RouteState Highway 4
CountyMiddlesex County
StateMassachusetts
Coordinates42.62262, -71.36721
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.9 US tons
Inventory rating57.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length164 ft (50 m)
Longest span79 ft (24 m)
Deck width70 ft (21.4 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,018 (2018)
Projected traffic23,058 by 2032
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3.8 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 4 SB over US 3 Nb/Sb built?

It was built in 2004, making it 21 years old in 2025.

What condition is ST 4 SB over US 3 Nb/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 May 2023.

How much traffic does ST 4 SB over US 3 Nb/Sb carry?

About 14,018 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is ST 4 SB over US 3 Nb/Sb?

The structure is 164 ft (50 m) long with a longest span of 79 ft (24 m) and a deck 70 ft wide.

Who owns ST 4 SB over US 3 Nb/Sb?

It is owned by the State Highway Agency.