US Bridges

Williamson Road over Little Shenango Branch

Poor

Mercer County, Pennsylvania · 1000FT East of Rt 358 · Structure no. 000000000026203

Built
1934
91 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
32
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Williamson Road over Little Shenango Branch is a steel stringer/multi-beam or girder carrying Williamson Road over Little Shenango Branch in Mercer County, Pennsylvania. It was built in 1934, 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 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.

It carries about 32 vehicles a day, roughly 4% of them trucks, projected to reach 50 by 2039. The structure is 28 ft (8.5 m) long and 27 ft wide.

CarriesWilliamson Road
CrossesLittle Shenango Branch
Location1000FT East of Rt 358
RouteCity Street 7217
Coordinates41.42003, -80.30006
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32 (2024)
Projected traffic50 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost$570,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Williamson Road over Little Shenango Branch built?

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

What condition is Williamson Road over Little Shenango Branch 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 September 2024.

How much traffic does Williamson Road over Little Shenango Branch carry?

About 32 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Williamson Road over Little Shenango Branch?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 27 ft wide.

Who owns Williamson Road over Little Shenango Branch?

It is owned by the Town or Township Highway Agency.