US Bridges

Walther LN over Grasser Run

Fair

Allegheny County, Pennsylvania · 123001 Upper ST Clair Twp · Structure no. 000000000002245

Built
1976
49 years old
Condition
Fair
inspected November 2024
Type
Arch - Deck
Steel
Length
24 ft
2 main spans
Daily traffic
50
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Walther LN over Grasser Run is a steel arch - deck carrying Walther LN over Grasser Run in Allegheny County, Pennsylvania. It was built in 1976, so it is 49 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 60 by 2039. The structure is 24 ft (7.3 m) long and 19 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesWalther LN
CrossesGrasser Run
Location123001 Upper ST Clair Twp
RouteCity Street 0
CountyAllegheny County
StatePennsylvania
Coordinates40.32991, -80.06169
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
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 typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span11 ft (3.4 m)
Deck width19 ft (5.8 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic60 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Walther LN over Grasser Run built?

It was built in 1976, making it 49 years old in 2025.

What condition is Walther LN over Grasser 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 November 2024.

How much traffic does Walther LN over Grasser Run carry?

About 50 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Walther LN over Grasser Run?

The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.4 m) and a deck 19 ft wide.

Who owns Walther LN over Grasser Run?

It is owned by the Town or Township Highway Agency.