US Bridges

ST 3 NB over US 6

Good

Barnstable County, Massachusetts · @ Cape Cod Canal · Structure no. B170275YKDOTNBI

Built
2006
19 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
116 ft
1 main span
Daily traffic
26,567
2023 count
Owner
State
State Highway Agency

About this bridge

ST 3 NB over US 6 is a prestressed concrete tee beam carrying ST 3 NB over US 6 in Barnstable County, Massachusetts. It was built in 2006, so it is 19 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 26,567 vehicles a day, roughly 3% of them trucks, projected to reach 66,362 by 2031. The structure is 116 ft (35.4 m) long and 48 ft wide.

Location

Open in Google Maps
CarriesST 3 NB
CrossesUS 6
Location@ Cape Cod Canal
RouteState Highway 3
CountyBarnstable County
StateMassachusetts
Coordinates41.78237, -70.54343
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.9 US tons
Inventory rating57.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length116 ft (35.4 m)
Longest span106 ft (32.2 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,567 (2023)
Projected traffic66,362 by 2031
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$4.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST 3 NB over US 6 built?

It was built in 2006, making it 19 years old in 2025.

What condition is ST 3 NB over US 6 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 November 2024.

How much traffic does ST 3 NB over US 6 carry?

About 26,567 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is ST 3 NB over US 6?

The structure is 116 ft (35.4 m) long with a longest span of 106 ft (32.2 m) and a deck 48 ft wide.

Who owns ST 3 NB over US 6?

It is owned by the State Highway Agency.