US Bridges

US 6 /ST28/CRNBRY over Water Cohasset Narrows

Fair

Barnstable County, Massachusetts · At Wareham Bourne Tl · Structure no. B17017B75DOTNBI

Built
2014
11 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
360 ft
3 main spans
Daily traffic
17,845
2024 count
Owner
State
State Highway Agency

About this bridge

US 6 /ST28/CRNBRY over Water Cohasset Narrows is a prestressed concrete stringer/multi-beam or girder carrying US 6 /ST28/CRNBRY over Water Cohasset Narrows in Barnstable County, Massachusetts. It was built in 2014, so it is 11 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 17,845 vehicles a day, roughly 11% of them trucks. The structure is 360 ft (109.7 m) long and 71 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesUS 6 /ST28/CRNBRY
CrossesWater Cohasset Narrows
LocationAt Wareham Bourne Tl
RouteU.S. Route 6
CountyBarnstable County
StateMassachusetts
Coordinates41.74702, -70.62118
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length360 ft (109.7 m)
Longest span126 ft (38.4 m)
Deck width71 ft (21.5 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,845 (2024)
Projected traffic—
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed2.5 mi (4 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$12.9 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 6 /ST28/CRNBRY over Water Cohasset Narrows built?

It was built in 2014, making it 11 years old in 2025.

What condition is US 6 /ST28/CRNBRY over Water Cohasset Narrows 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 December 2024.

How much traffic does US 6 /ST28/CRNBRY over Water Cohasset Narrows carry?

About 17,845 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is US 6 /ST28/CRNBRY over Water Cohasset Narrows?

The structure is 360 ft (109.7 m) long with a longest span of 126 ft (38.4 m) and a deck 71 ft wide.

Who owns US 6 /ST28/CRNBRY over Water Cohasset Narrows?

It is owned by the State Highway Agency.