US Bridges

SR 0079 NB over Slippery Rock Creek

Fair

Butler County, Pennsylvania · Slippery Rock Creek NB · Structure no. 000000000007886

Built
1964
61 years old, rebuilt 1989
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
274 ft
3 main spans
Daily traffic
15,271
2024 count
Owner
State
State Highway Agency

About this bridge

SR 0079 NB over Slippery Rock Creek is a steel continuous stringer/multi-beam or girder carrying SR 0079 NB over Slippery Rock Creek in Butler County, Pennsylvania. It was built in 1964 and reconstructed in 1989, so it is 61 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 15,271 vehicles a day, roughly 18% of them trucks, projected to reach 16,140 by 2032. The structure is 274 ft (83.5 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 0079 NB
CrossesSlippery Rock Creek
LocationSlippery Rock Creek NB
RouteInterstate 79
CountyButler County
StatePennsylvania
Coordinates41.03647, -80.12348
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length274 ft (83.5 m)
Longest span106 ft (32.3 m)
Deck width38 ft (11.6 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,271 (2024)
Projected traffic16,140 by 2032
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$930,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 0079 NB over Slippery Rock Creek built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1989.

What condition is SR 0079 NB 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 July 2023.

How much traffic does SR 0079 NB over Slippery Rock Creek carry?

About 15,271 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is SR 0079 NB over Slippery Rock Creek?

The structure is 274 ft (83.5 m) long with a longest span of 106 ft (32.3 m) and a deck 38 ft wide.

Who owns SR 0079 NB over Slippery Rock Creek?

It is owned by the State Highway Agency.