US Bridges

SR 504-PA 504 over Dewitt Run

Fair

Centre County, Pennsylvania · Unionville · Structure no. 000000000009545

Built
1934
91 years old, rebuilt 1984
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
254
2024 count
Owner
State
State Highway Agency

About this bridge

SR 504-PA 504 over Dewitt Run is a prestressed concrete box beam or girders - multiple carrying SR 504-PA 504 over Dewitt Run in Centre County, Pennsylvania. It was built in 1934 and reconstructed in 1984, so it is 91 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 254 vehicles a day, roughly 16% of them trucks, projected to reach 285 by 2044. The structure is 23 ft (7 m) long and 30 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

Location

Open in Google Maps
CarriesSR 504-PA 504
CrossesDewitt Run
LocationUnionville
RouteState Highway 504
CountyCentre County
StatePennsylvania
Coordinates40.92337, -77.89975
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating77.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic254 (2024)
Projected traffic285 by 2044
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.1 mi (71 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 504-PA 504 over Dewitt Run built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1984.

What condition is SR 504-PA 504 over Dewitt 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 September 2024.

How much traffic does SR 504-PA 504 over Dewitt Run carry?

About 254 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is SR 504-PA 504 over Dewitt Run?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 30 ft wide.

Who owns SR 504-PA 504 over Dewitt Run?

It is owned by the State Highway Agency.