Structure 1817150 · Somerset County, NJ

I-78 Eastbound over I-78 Ramp "a"

Carries I-78 Eastbound over I-78 Ramp "a", 0.3 Mi West Of I-287 Jct.

Overall conditionPoor

Set by its lowest-rated component: Deck at 4 of 9.

How ratings work
Decksets the rating4/9 · Poor
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT166 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 6/9Substructure 6/9

166 ft end to end: about 2 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.

Built196363 years old
Length166.0 ft50.6 m
Daily traffic60,048counted 2024
Last inspectedOctober 2024every 24 months

Location

StateNew Jersey
CountySomerset
Location0.3 Mi West Of I-287 Jct
CarriesI-78 Eastbound
CrossesI-78 Ramp "a"
Coordinates40.64291, -74.65116

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length166.0 ft (50.6 m)
Max Span149.9 ft (45.7 m)
Deck Width44.6 ft (13.6 m)
Deck Area688.2 sq m
Main Spans1
Year Built1963

Traffic

Avg Daily Traffic60,048 (2024)
Truck Traffic14%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number1817150

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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