Structure 14225 · Dauphin County, PA

I-81 Sb; SR 0081 over Twp RD 318; Kohn RD

Carries I-81 Sb; SR 0081 over Twp RD 318; Kohn RD, 1.5 Mi.n. Progress.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT41 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 8/9Substructure 6/9 · sets the rating

41 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 box-beam bridge.

Built196957 years old
Length41.0 ft12.5 m
Daily traffic45,173counted 2024
Last inspectedOctober 2022every 24 months

Location

StatePennsylvania
CountyDauphin
Location1.5 Mi.n. Progress
CarriesI-81 Sb; SR 0081
CrossesTwp RD 318; Kohn RD
Coordinates40.30183, -76.85742

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length41.0 ft (12.5 m)
Max Span37.1 ft (11.3 m)
Deck Width55.4 ft (16.9 m)
Deck Area211.2 sq m
Main Spans1
Year Built1969

Traffic

Avg Daily Traffic45,173 (2024)
Truck Traffic22%
Lanes On Bridge4
Lanes Under Bridge2

Inspection & Ownership

Last InspectionOctober 2022
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000014225

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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