US Bridges

T-539 Dematteis over N Br Slippery Rock CR

Fair

Butler County, Pennsylvania · 0.63 MI SW of SR 4012 · Structure no. 000000000008258

Built
1910
115 years old, rebuilt 1992
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
100
2017 count
Owner
County
County Highway Agency

About this bridge

T-539 Dematteis over N Br Slippery Rock CR is a steel stringer/multi-beam or girder carrying T-539 Dematteis over N Br Slippery Rock CR in Butler County, Pennsylvania. It was built in 1910 and reconstructed in 1992, so it is 115 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 100 vehicles a day, roughly 9% of them trucks, projected to reach 140 by 2037. The structure is 28 ft (8.5 m) long and 17 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesT-539 Dematteis
CrossesN Br Slippery Rock CR
Location0.63 MI SW of SR 4012
RouteCity Street 0
CountyButler County
StatePennsylvania
Coordinates41.1002, -79.93292
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2017)
Projected traffic140 by 2037
Trucks9%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was T-539 Dematteis over N Br Slippery Rock CR built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1992.

What condition is T-539 Dematteis over N Br Slippery Rock CR 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 T-539 Dematteis over N Br Slippery Rock CR carry?

About 100 vehicles per day (2017 count), of which roughly 9% are trucks.

How long is T-539 Dematteis over N Br Slippery Rock CR?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 17 ft wide.

Who owns T-539 Dematteis over N Br Slippery Rock CR?

It is owned by the County Highway Agency.