US Bridges

Clairton Bl over Fallen Timber Run

Fair

Allegheny County, Pennsylvania · @ Int.W/Roberts Hollow RD · Structure no. 000000000000708

Built
1948
77 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
21 ft
1 main span
Daily traffic
20,208
2024 count
Owner
State
State Highway Agency

About this bridge

Clairton Bl over Fallen Timber Run is a concrete culvert carrying Clairton Bl over Fallen Timber Run in Allegheny County, Pennsylvania. It was built in 1948, so it is 77 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 6 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 20,208 vehicles a day, roughly 6% of them trucks, projected to reach 23,558 by 2032. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesClairton Bl
CrossesFallen Timber Run
Location@ Int.W/Roberts Hollow RD
RouteState Highway 51
CountyAllegheny County
StatePennsylvania
Coordinates40.24954, -79.87746
Functional classUrban Other Principal Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable 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 length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,208 (2024)
Projected traffic23,558 by 2032
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Clairton Bl over Fallen Timber Run built?

It was built in 1948, making it 77 years old in 2025.

What condition is Clairton Bl over Fallen Timber 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 December 2023.

How much traffic does Clairton Bl over Fallen Timber Run carry?

About 20,208 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Clairton Bl over Fallen Timber Run?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m).

Who owns Clairton Bl over Fallen Timber Run?

It is owned by the State Highway Agency.