US Bridges

T-376 Cty Br. 20 over Buffalo Creek

PoorPosted for load

Union County, Pennsylvania · 2.3 Mi. W of Mifflinburg · Structure no. 000000000033605

Built
1900
125 years old, rebuilt 1958
Condition
Poor
inspected March 2023
Type
Truss - Thru
Wood or Timber
Length
70 ft
1 main span
Daily traffic
150
2024 count
Owner
County
County Highway Agency

About this bridge

T-376 Cty Br. 20 over Buffalo Creek is a wood or timber truss - thru carrying T-376 Cty Br. 20 over Buffalo Creek in Union County, Pennsylvania. It was built in 1900 and reconstructed in 1958, so it is 125 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 150 vehicles a day, roughly 1% of them trucks, projected to reach 232 by 2046. The structure is 70 ft (21.3 m) long and 17 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesT-376 Cty Br. 20
CrossesBuffalo Creek
Location2.3 Mi. W of Mifflinburg
RouteCity Street 0
CountyUnion County
StatePennsylvania
Coordinates40.9173, -77.09151
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating8 US tons
Inventory rating6 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 20
Structure length70 ft (21.3 m)
Longest span59 ft (18 m)
Deck width17 ft (5.1 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deck7 ft (2.1 m)

Traffic and service

Average daily traffic150 (2024)
Projected traffic232 by 2046
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$122,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-376 Cty Br. 20 over Buffalo Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1958.

What condition is T-376 Cty Br. 20 over Buffalo 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 March 2023.

How much traffic does T-376 Cty Br. 20 over Buffalo Creek carry?

About 150 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is T-376 Cty Br. 20 over Buffalo Creek?

The structure is 70 ft (21.3 m) long with a longest span of 59 ft (18 m) and a deck 17 ft wide.

Who owns T-376 Cty Br. 20 over Buffalo Creek?

It is owned by the County Highway Agency.