Structure 1016159 · Hunterdon County, NJ

I-78WB US 22wb over Leigh St.

Carries I-78WB US 22wb over Leigh St., 1 Mi West Of RT 31.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT62 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 6/9

62 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built195868 years old
Length62.0 ft18.9 m
Daily traffic51,605counted 2024
Last inspectedJuly 2024every 24 months

Location

StateNew Jersey
CountyHunterdon
Location1 Mi West Of RT 31
CarriesI-78WB US 22wb
CrossesLeigh St.
Coordinates40.63410, -74.90755

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length62.0 ft (18.9 m)
Max Span58.1 ft (17.7 m)
Deck Width57.1 ft (17.4 m)
Deck Area328.9 sq m
Main Spans1
Year Built1958

Traffic

Avg Daily Traffic51,605 (2024)
Truck Traffic9%
Lanes On Bridge3
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number1016159

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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