US Bridges

Simpson Road over Dunlap Creek

PoorClosed to traffic

Fayette County, Pennsylvania · Simpson Station · Structure no. 000000000017114

Built
1905
120 years old
Condition
Poor
inspected October 2023
Type
Truss - Thru
Steel
Length
78 ft
1 main span
Daily traffic
50
2006 count
Owner
County
County Highway Agency

About this bridge

Simpson Road over Dunlap Creek is a steel truss - thru carrying Simpson Road over Dunlap Creek in Fayette County, Pennsylvania. It was built in 1905, so it is 120 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 1 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: closed to all traffic.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 21 by 2012. The structure is 78 ft (23.8 m) long and 15 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSimpson Road
CrossesDunlap Creek
LocationSimpson Station
RouteCity Street 0T326
Coordinates39.99059, -79.88779
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure1 Imminent FailureMajor deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length78 ft (23.8 m)
Longest span78 ft (23.8 m)
Deck width15 ft (4.6 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2006)
Projected traffic21 by 2012
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$133,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Simpson Road over Dunlap Creek built?

It was built in 1905, making it 120 years old in 2025.

What condition is Simpson Road over Dunlap Creek 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 October 2023.

How much traffic does Simpson Road over Dunlap Creek carry?

About 50 vehicles per day (2006 count), of which roughly 5% are trucks.

How long is Simpson Road over Dunlap Creek?

The structure is 78 ft (23.8 m) long with a longest span of 78 ft (23.8 m) and a deck 15 ft wide.

Who owns Simpson Road over Dunlap Creek?

It is owned by the County Highway Agency.