US Bridges

T-478 over Chatham Run

Fair

Clinton County, Pennsylvania · Within Woolrich · Structure no. 000000000012409

Built
1920
105 years old, rebuilt 2013
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
50
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T-478 over Chatham Run is a steel stringer/multi-beam or girder carrying T-478 over Chatham Run in Clinton County, Pennsylvania. It was built in 1920 and reconstructed in 2013, so it is 105 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 77 by 2045. The structure is 28 ft (8.5 m) long and 19 ft wide.

Location

Open in Google Maps
CarriesT-478
CrossesChatham Run
LocationWithin Woolrich
RouteCity Street 0
CountyClinton County
StatePennsylvania
Coordinates41.19421, -77.37393
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating110.1 US tons
Inventory rating68 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width19 ft (5.8 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic77 by 2045
Trucks2%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$457,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-478 over Chatham Run built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 2013.

What condition is T-478 over Chatham 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 July 2023.

How much traffic does T-478 over Chatham Run carry?

About 50 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is T-478 over Chatham Run?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 19 ft wide.

Who owns T-478 over Chatham Run?

It is owned by the Town or Township Highway Agency.