Structure 902 · Allegheny County, PA

Raymond Shafer Hw over Glenfield RD Kilbuck Run

Carries Raymond Shafer Hw over Glenfield RD Kilbuck Run, Sr79 NB Over Glenfield RD.

Overall conditionFair

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

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT431 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 6/9 · sets the ratingSubstructure 7/9

431 ft end to end, longest span 108 ft: about 6 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.

Built1971rebuilt 2022
Length431.1 ft131.4 m
Daily traffic17,569counted 2024
Last inspectedMay 2024every 24 months

Location

StatePennsylvania
CountyAllegheny
LocationSr79 NB Over Glenfield RD
CarriesRaymond Shafer Hw
CrossesGlenfield RD Kilbuck Run
Coordinates40.52854, -80.12911

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length431.1 ft (131.4 m)
Max Span107.9 ft (32.9 m)
Deck Width44.0 ft (13.4 m)
Deck Area1760.8 sq m
Main Spans4
Year Built1971 (reconstructed 2022)

Traffic

Avg Daily Traffic17,569 (2024)
Truck Traffic36%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000000902

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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