US Bridges

Mountain Road over Rockaway Creek

Poor

Hunterdon County, New Jersey · 0.9 MI West of CR 517 · Structure no. 100T132

Built
1901
124 years old
Condition
Poor
inspected April 2023
Type
Arch - Deck
Masonry
Length
22 ft
1 main span
Daily traffic
169
2023 count
Owner
County
County Highway Agency

About this bridge

Mountain Road over Rockaway Creek is a masonry arch - deck carrying Mountain Road over Rockaway Creek in Hunterdon County, New Jersey. It was built in 1901, so it is 124 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 169 vehicles a day, roughly 3% of them trucks, projected to reach 203 by 2043. The structure is 22 ft (6.7 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMountain Road
CrossesRockaway Creek
Location0.9 MI West of CR 517
CountyHunterdon County
StateNew Jersey
Coordinates40.70087, -74.7866
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating34 US tons
Inventory rating20 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width16 ft (4.8 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic169 (2023)
Projected traffic203 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$689,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mountain Road over Rockaway Creek built?

It was built in 1901, making it 124 years old in 2025.

What condition is Mountain Road over Rockaway Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does Mountain Road over Rockaway Creek carry?

About 169 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Mountain Road over Rockaway Creek?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 16 ft wide.

Who owns Mountain Road over Rockaway Creek?

It is owned by the County Highway Agency.