US Bridges

Old Mountain Road over Rockaway Creek

Fair

Hunterdon County, New Jersey · .01 MI E of Sawmill Road · Structure no. 10XXT85

Built
1900
125 years old, rebuilt 2013
Condition
Fair
inspected May 2023
Type
Girder and Floorbeam System
Steel
Length
60 ft
1 main span
Daily traffic
11
2023 count
Owner
County
County Highway Agency

About this bridge

Old Mountain Road over Rockaway Creek is a steel girder and floorbeam system carrying Old Mountain Road over Rockaway Creek in Hunterdon County, New Jersey. It was built in 1900 and reconstructed in 2013, so it is 125 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 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 11 vehicles a day, projected to reach 13 by 2043. The structure is 60 ft (18.3 m) long and 12 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesOld Mountain Road
CrossesRockaway Creek
Location.01 MI E of Sawmill Road
CountyHunterdon County
StateNew Jersey
Coordinates40.69173, -74.81
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span55 ft (16.8 m)
Deck width12 ft (3.6 m)
Roadway width12 ft (3.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2023)
Projected traffic13 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$905,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Mountain Road over Rockaway Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2013.

What condition is Old Mountain Road over Rockaway 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 May 2023.

How much traffic does Old Mountain Road over Rockaway Creek carry?

About 11 vehicles per day (2023 count).

How long is Old Mountain Road over Rockaway Creek?

The structure is 60 ft (18.3 m) long with a longest span of 55 ft (16.8 m) and a deck 12 ft wide.

Who owns Old Mountain Road over Rockaway Creek?

It is owned by the County Highway Agency.