US Bridges

SR0173 over Trib of Wolf Creek

Fair

Butler County, Pennsylvania · Armstrong · Structure no. 000000000007898

Built
1936
89 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
4,083
2024 count
Owner
State
State Highway Agency

About this bridge

SR0173 over Trib of Wolf Creek is a concrete slab carrying SR0173 over Trib of Wolf Creek in Butler County, Pennsylvania. It was built in 1936, so it is 89 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 4,083 vehicles a day, roughly 11% of them trucks, projected to reach 6,695 by 2032. The structure is 22 ft (6.7 m) long and 37 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR0173
CrossesTrib of Wolf Creek
LocationArmstrong
RouteState Highway 173
CountyButler County
StatePennsylvania
Coordinates41.09295, -80.05174
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span18 ft (5.5 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,083 (2024)
Projected traffic6,695 by 2032
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$253,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR0173 over Trib of Wolf Creek built?

It was built in 1936, making it 89 years old in 2025.

What condition is SR0173 over Trib of Wolf Creek 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 October 2023.

How much traffic does SR0173 over Trib of Wolf Creek carry?

About 4,083 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is SR0173 over Trib of Wolf Creek?

The structure is 22 ft (6.7 m) long with a longest span of 18 ft (5.5 m) and a deck 37 ft wide.

Who owns SR0173 over Trib of Wolf Creek?

It is owned by the State Highway Agency.