US Bridges

SR4008 over Slippery Rock Creek

Fair

Butler County, Pennsylvania · West Liberty NO.2 · Structure no. 000000000008129

Built
1962
63 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
106 ft
2 main spans
Daily traffic
659
2024 count
Owner
State
State Highway Agency

About this bridge

SR4008 over Slippery Rock Creek is a prestressed concrete box beam or girders - multiple carrying SR4008 over Slippery Rock Creek in Butler County, Pennsylvania. It was built in 1962, so it is 63 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 659 vehicles a day, roughly 6% of them trucks, projected to reach 885 by 2032. The structure is 106 ft (32.3 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR4008
CrossesSlippery Rock Creek
LocationWest Liberty NO.2
RouteState Highway 0
CountyButler County
StatePennsylvania
Coordinates41.01843, -80.04572
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating29 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span50 ft (15.2 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic659 (2024)
Projected traffic885 by 2032
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$416,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR4008 over Slippery Rock Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is SR4008 over Slippery Rock 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 February 2024.

How much traffic does SR4008 over Slippery Rock Creek carry?

About 659 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR4008 over Slippery Rock Creek?

The structure is 106 ft (32.3 m) long with a longest span of 50 ft (15.2 m) and a deck 33 ft wide.

Who owns SR4008 over Slippery Rock Creek?

It is owned by the State Highway Agency.