US Bridges

County Route 579 over Trib. 3rd Neshanic River

Fair

Hunterdon County, New Jersey · 0.4 MI N of Toad Lane · Structure no. 1000022

Built
1837
188 years old, rebuilt 2008
Condition
Fair
inspected March 2023
Type
Arch - Deck
Masonry
Length
45 ft
2 main spans
Daily traffic
5,146
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 579 over Trib. 3rd Neshanic River is a masonry arch - deck carrying County Route 579 over Trib. 3rd Neshanic River in Hunterdon County, New Jersey. It was built in 1837 and reconstructed in 2008, so it is 188 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 5,146 vehicles a day, roughly 3% of them trucks, projected to reach 6,279 by 2043. The structure is 45 ft (13.7 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Route 579
CrossesTrib. 3rd Neshanic River
Location0.4 MI N of Toad Lane
RouteCounty Highway 579
CountyHunterdon County
StateNew Jersey
Coordinates40.44686, -74.874
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans2
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span18 ft (5.5 m)
Deck width34 ft (10.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,146 (2023)
Projected traffic6,279 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 579 over Trib. 3rd Neshanic River built?

It was built in 1837, making it 188 years old in 2025. It was reconstructed in 2008.

What condition is County Route 579 over Trib. 3rd Neshanic River 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 March 2023.

How much traffic does County Route 579 over Trib. 3rd Neshanic River carry?

About 5,146 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Route 579 over Trib. 3rd Neshanic River?

The structure is 45 ft (13.7 m) long with a longest span of 18 ft (5.5 m) and a deck 34 ft wide.

Who owns County Route 579 over Trib. 3rd Neshanic River?

It is owned by the County Highway Agency.