US Bridges

Guinea Hollow RD over N Br Rockway Creek

Fair

Hunterdon County, New Jersey · 0.5 M N of Mountainville · Structure no. 1000041

Built
1899
126 years old, rebuilt 1992
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
1,041
2023 count
Owner
County
County Highway Agency

About this bridge

Guinea Hollow RD over N Br Rockway Creek is a steel stringer/multi-beam or girder carrying Guinea Hollow RD over N Br Rockway Creek in Hunterdon County, New Jersey. It was built in 1899 and reconstructed in 1992, so it is 126 years old, older than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 1,041 vehicles a day, roughly 3% of them trucks, projected to reach 1,269 by 2043. The structure is 32 ft (9.8 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGuinea Hollow RD
CrossesN Br Rockway Creek
Location0.5 M N of Mountainville
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.69563, -74.81205
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,041 (2023)
Projected traffic1,269 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$396,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Guinea Hollow RD over N Br Rockway Creek built?

It was built in 1899, making it 126 years old in 2025. It was reconstructed in 1992.

What condition is Guinea Hollow RD over N Br Rockway Creek 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 April 2023.

How much traffic does Guinea Hollow RD over N Br Rockway Creek carry?

About 1,041 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Guinea Hollow RD over N Br Rockway Creek?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 16 ft wide.

Who owns Guinea Hollow RD over N Br Rockway Creek?

It is owned by the County Highway Agency.