US Bridges

West Carson ST over Saw Mill Run

Fair

Allegheny County, Pennsylvania · Pgh.@ West End Circle · Structure no. 000000000001879

Built
1910
115 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
36 ft
1 main span
Daily traffic
14,731
2024 count
Owner
State
State Highway Agency

About this bridge

West Carson ST over Saw Mill Run is a concrete culvert carrying West Carson ST over Saw Mill Run in Allegheny County, Pennsylvania. It was built in 1910, so it is 115 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 5 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 14,731 vehicles a day, roughly 8% of them trucks, projected to reach 17,171 by 2032. The structure is 36 ft (11 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesWest Carson ST
CrossesSaw Mill Run
LocationPgh.@ West End Circle
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.44424, -80.0284
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span36 ft (11 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,731 (2024)
Projected traffic17,171 by 2032
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$126,000
NavigationNo navigation control on waterway

Frequently asked questions

When was West Carson ST over Saw Mill Run built?

It was built in 1910, making it 115 years old in 2025.

What condition is West Carson 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 2023.

How much traffic does West Carson ST over Saw Mill Run carry?

About 14,731 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is West Carson ST over Saw Mill Run?

The structure is 36 ft (11 m) long with a longest span of 36 ft (11 m) and a deck 40 ft wide.

Who owns West Carson ST over Saw Mill Run?

It is owned by the State Highway Agency.