US Bridges

South Main ST over Saw Mill Run

Fair

Allegheny County, Pennsylvania · 1200 SW of W End Circle · Structure no. 000000000000765

Built
1900
125 years old, rebuilt 2007
Condition
Fair
inspected June 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
7,600
2024 count
Owner
State
State Highway Agency

About this bridge

South Main ST over Saw Mill Run is a prestressed concrete box beam or girders - multiple carrying South Main ST over Saw Mill Run in Allegheny County, Pennsylvania. It was built in 1900 and reconstructed in 2007, so it is 125 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,600 vehicles a day, roughly 4% of them trucks, projected to reach 8,594 by 2032. The structure is 62 ft (18.9 m) long and 59 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSouth Main ST
CrossesSaw Mill Run
Location1200 SW of W End Circle
RouteState Highway 60
CountyAllegheny County
StatePennsylvania
Coordinates40.44209, -80.03162
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.9 US tons
Inventory rating44 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span58 ft (17.7 m)
Deck width59 ft (18 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,600 (2024)
Projected traffic8,594 by 2032
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$404,000
NavigationNo navigation control on waterway

Frequently asked questions

When was South Main ST over Saw Mill Run built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2007.

What condition is South Main ST over Saw Mill Run in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2022.

How much traffic does South Main ST over Saw Mill Run carry?

About 7,600 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is South Main ST over Saw Mill Run?

The structure is 62 ft (18.9 m) long with a longest span of 58 ft (17.7 m) and a deck 59 ft wide.

Who owns South Main ST over Saw Mill Run?

It is owned by the State Highway Agency.