Structure 2392 · Allegheny County, PA

Alexander ST over Saw Mill Run

Carries Alexander ST over Saw Mill Run, 001 Alexander ST Bridge.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT42 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 5/9

42 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 girder bridge.

Built1924rebuilt 2010
Length42.0 ft12.8 m
Daily traffic20counted 2024
Last inspectedJune 2024every 24 months

Location

StatePennsylvania
CountyAllegheny
Location001 Alexander ST Bridge
CarriesAlexander ST
CrossesSaw Mill Run
Coordinates40.44008, -80.03336

Physical Characteristics

MaterialSteel
DesignGirder and Floorbeam
Total Length42.0 ft (12.8 m)
Max Span40.0 ft (12.2 m)
Deck Width11.8 ft (3.6 m)
Deck Area46.1 sq m
Main Spans1
Year Built1924 (reconstructed 2010)

Traffic

Avg Daily Traffic20 (2024)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number000000000002392

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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