Structure 2010154 · Union County, NJ

I-78 over Diamond Hill RD (co 655)

Carries I-78 over Diamond Hill RD (co 655), 1.8 Mi E Of I-78 Exit 43.

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
SEMI-TRUCK · 72 FT183 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 6/9 · sets the rating

183 ft end to end, longest span 98 ft: about 3 semi-trucks nose to tail. Lengths and the semi-truck 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.

Built198640 years old
Length183.1 ft55.8 m
Daily traffic105,635counted 2024
Last inspectedApril 2024every 24 months

Location

StateNew Jersey
CountyUnion
Location1.8 Mi E Of I-78 Exit 43
CarriesI-78
CrossesDiamond Hill RD (co 655)
Coordinates40.67312, -74.40664

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length183.1 ft (55.8 m)
Max Span98.1 ft (29.9 m)
Deck Width125.7 ft (38.3 m)
Deck Area2137.1 sq m
Main Spans3
Year Built1986

Traffic

Avg Daily Traffic105,635 (2024)
Truck Traffic9%
Lanes On Bridge6
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number2010154

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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