US Bridges

Triphammer RD T315 over Piney Fork

Fair

Allegheny County, Pennsylvania · PF01 Piney Fork # 1 · Structure no. 000000000002360

Built
1902
123 years old, rebuilt 2014
Condition
Fair
inspected March 2023
Type
Arch - Deck
Masonry
Length
30 ft
1 main span
Daily traffic
803
2023 count
Owner
County
County Highway Agency

About this bridge

Triphammer RD T315 over Piney Fork is a masonry arch - deck carrying Triphammer RD T315 over Piney Fork in Allegheny County, Pennsylvania. It was built in 1902 and reconstructed in 2014, so it is 123 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 803 vehicles a day, roughly 1% of them trucks, projected to reach 850 by 2043. The structure is 30 ft (9.1 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTriphammer RD T315
CrossesPiney Fork
LocationPF01 Piney Fork # 1
RouteCity Street 0
CountyAllegheny County
StatePennsylvania
Coordinates40.28198, -79.98378
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 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
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic803 (2023)
Projected traffic850 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$52,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Triphammer RD T315 over Piney Fork built?

It was built in 1902, making it 123 years old in 2025. It was reconstructed in 2014.

What condition is Triphammer RD T315 over Piney Fork 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 March 2023.

How much traffic does Triphammer RD T315 over Piney Fork carry?

About 803 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Triphammer RD T315 over Piney Fork?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.

Who owns Triphammer RD T315 over Piney Fork?

It is owned by the County Highway Agency.