US Bridges

ST 3 NB over US 3 SB Connector

Good

Middlesex County, Massachusetts · 0.25 M Sly N.H. Line · Structure no. T0902284YDOTNBI

Built
2004
21 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
123 ft
1 main span
Daily traffic
48,000
2018 count
Owner
State
State Highway Agency

About this bridge

ST 3 NB over US 3 SB Connector is a steel stringer/multi-beam or girder carrying ST 3 NB over US 3 SB Connector 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 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 48,000 vehicles a day, roughly 10% of them trucks, projected to reach 67,910 by 2032. The structure is 123 ft (37.4 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesST 3 NB
CrossesUS 3 SB Connector
Location0.25 M Sly N.H. Line
RouteU.S. Route 3
CountyMiddlesex County
StateMassachusetts
Coordinates42.69759, -71.4477
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107 US tons
Inventory rating64.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length123 ft (37.4 m)
Longest span121 ft (36.9 m)
Deck width79 ft (24.2 m)
Roadway width76 ft (23.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,000 (2018)
Projected traffic67,910 by 2032
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$898,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 3 NB over US 3 SB Connector built?

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

What condition is ST 3 NB over US 3 SB Connector 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 2023.

How much traffic does ST 3 NB over US 3 SB Connector carry?

About 48,000 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is ST 3 NB over US 3 SB Connector?

The structure is 123 ft (37.4 m) long with a longest span of 121 ft (36.9 m) and a deck 79 ft wide.

Who owns ST 3 NB over US 3 SB Connector?

It is owned by the State Highway Agency.