US Bridges

Hillburne ST over Irwins Run

Fair

Allegheny County, Pennsylvania · 144 Hillburn ST Ped Bridg · Structure no. 000000000002469

Built
1995
30 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
10
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hillburne ST over Irwins Run is a steel stringer/multi-beam or girder carrying Hillburne ST over Irwins Run in Allegheny County, Pennsylvania. It was built in 1995, so it is 30 years old, younger 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 10 vehicles a day, roughly 3% of them trucks, projected to reach 11 by 2043. The structure is 24 ft (7.3 m) long and 12 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesHillburne ST
CrossesIrwins Run
Location144 Hillburn ST Ped Bridg
RouteCity Street 0
CountyAllegheny County
StatePennsylvania
Coordinates40.38324, -79.93138
Functional classUrban Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating82 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span21 ft (6.4 m)
Deck width12 ft (3.8 m)
Roadway width11 ft (3.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2021)
Projected traffic11 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hillburne ST over Irwins Run built?

It was built in 1995, making it 30 years old in 2025.

What condition is Hillburne ST over Irwins 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 Hillburne ST over Irwins Run carry?

About 10 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Hillburne ST over Irwins Run?

The structure is 24 ft (7.3 m) long with a longest span of 21 ft (6.4 m) and a deck 12 ft wide.

Who owns Hillburne ST over Irwins Run?

It is owned by the City or Municipal Highway Agency.