US Bridges

HWY Rock Hrbr RD over US 6 Mid Cape HWY

Good

Barnstable County, Massachusetts · 1 MI W of Eastham Tl · Structure no. O0400549WDOTNBI

Built
1958
67 years old, rebuilt 1987
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
146 ft
3 main spans
Daily traffic
4,192
2021 count
Owner
State
State Highway Agency

About this bridge

HWY Rock Hrbr RD over US 6 Mid Cape HWY is a steel continuous stringer/multi-beam or girder carrying HWY Rock Hrbr RD over US 6 Mid Cape HWY in Barnstable County, Massachusetts. It was built in 1958 and reconstructed in 1987, so it is 67 years old, older 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 4,192 vehicles a day, roughly 6% of them trucks, projected to reach 8,054 by 2031. The structure is 146 ft (44.5 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesHWY Rock Hrbr RD
CrossesUS 6 Mid Cape HWY
Location1 MI W of Eastham Tl
RouteCity Street 0
Coordinates41.79275, -70.00043
Functional classUrban Minor Arterial

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length146 ft (44.5 m)
Longest span55 ft (16.8 m)
Deck width48 ft (14.7 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,192 (2021)
Projected traffic8,054 by 2031
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY Rock Hrbr RD over US 6 Mid Cape HWY built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1987.

What condition is HWY Rock Hrbr RD over US 6 Mid Cape HWY 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 April 2024.

How much traffic does HWY Rock Hrbr RD over US 6 Mid Cape HWY carry?

About 4,192 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is HWY Rock Hrbr RD over US 6 Mid Cape HWY?

The structure is 146 ft (44.5 m) long with a longest span of 55 ft (16.8 m) and a deck 48 ft wide.

Who owns HWY Rock Hrbr RD over US 6 Mid Cape HWY?

It is owned by the State Highway Agency.