Structure 765 · Allegheny County, PA

South Main ST over Saw Mill Run

Carries South Main ST over Saw Mill Run, 1200 SW Of W End Circle.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT62 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

62 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.

Built1900rebuilt 2007
Length62.0 ft18.9 m
Daily traffic7,600counted 2024
Last inspectedJune 2022every 48 months

Location

StatePennsylvania
CountyAllegheny
Location1200 SW Of W End Circle
CarriesSouth Main ST
CrossesSaw Mill Run
Coordinates40.44209, -80.03162

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length62.0 ft (18.9 m)
Max Span58.1 ft (17.7 m)
Deck Width59.1 ft (18 m)
Deck Area340.2 sq m
Main Spans1
Year Built1900 (reconstructed 2007)

Traffic

Avg Daily Traffic7,600 (2024)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical7 — Countermeasures installed
Structure Number000000000000765

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.

Nearby Bridges