US Bridges

Grant Ave Ext over Thompson Run

Fair

Allegheny County, Pennsylvania · At Int. Lwr Bull Run RD · Structure no. 000000000048956

Built
1985
40 years old
Condition
Fair
inspected August 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
47 ft
2 main spans
Daily traffic
750
2017 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Grant Ave Ext over Thompson Run is a aluminum, wrought iron, or cast iron culvert carrying Grant Ave Ext over Thompson Run in Allegheny County, Pennsylvania. It was built in 1985, so it is 40 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 750 vehicles a day, roughly 1% of them trucks, projected to reach 850 by 2037. The structure is 47 ft (14.3 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesGrant Ave Ext
CrossesThompson Run
LocationAt Int. Lwr Bull Run RD
RouteCity Street 7437
CountyAllegheny County
StatePennsylvania
Coordinates40.36934, -79.87555
Functional classRural 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
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span23 ft (7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2017)
Projected traffic850 by 2037
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Grant Ave Ext over Thompson Run built?

It was built in 1985, making it 40 years old in 2025.

What condition is Grant Ave Ext over Thompson 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 August 2023.

How much traffic does Grant Ave Ext over Thompson Run carry?

About 750 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is Grant Ave Ext over Thompson Run?

The structure is 47 ft (14.3 m) long with a longest span of 23 ft (7 m).

Who owns Grant Ave Ext over Thompson Run?

It is owned by the Town or Township Highway Agency.