US Bridges

T-504 Windmill RD over Town Run

PoorPosted for load

Clarion County, Pennsylvania · 3.3 MI N of Hawthorne · Structure no. 000000000011163

Built
1940
85 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
50
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T-504 Windmill RD over Town Run is a steel stringer/multi-beam or girder carrying T-504 Windmill RD over Town Run in Clarion County, Pennsylvania. It was built in 1940, so it is 85 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 75 by 2043. The structure is 26 ft (7.9 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesT-504 Windmill RD
CrossesTown Run
Location3.3 MI N of Hawthorne
RouteCity Street 0
Coordinates41.06394, -79.284
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18 US tons
Inventory rating10 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$258,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-504 Windmill RD over Town Run built?

It was built in 1940, making it 85 years old in 2025.

What condition is T-504 Windmill RD over Town Run in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does T-504 Windmill RD over Town Run carry?

About 50 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is T-504 Windmill RD over Town Run?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns T-504 Windmill RD over Town Run?

It is owned by the Town or Township Highway Agency.