Structure 1016151 · Hunterdon County, NJ

I-78 WB over Nj 173

Carries I-78 WB over Nj 173, At I-78 Exit 15.

Overall conditionFair

Set by its lowest-rated component: Superstructure and Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT73 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 6/9 · sets the rating

73 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
Length73.2 ft22.3 m
Daily traffic44,645counted 2024
Last inspectedApril 2024every 24 months

Location

StateNew Jersey
CountyHunterdon
LocationAt I-78 Exit 15
CarriesI-78 WB
CrossesNj 173
Coordinates40.63146, -74.91919

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length73.2 ft (22.3 m)
Max Span67.9 ft (20.7 m)
Deck Width57.1 ft (17.4 m)
Deck Area388.0 sq m
Main Spans1
Year Built1958

Traffic

Avg Daily Traffic44,645 (2024)
Truck Traffic9%
Lanes On Bridge3
Lanes Under Bridge3

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number1016151

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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