US Bridges

T-421 (cty. Br. 2) over White Deer Hole Creek

PoorPosted for load

Union County, Pennsylvania · 0.25 Mi.S of Allenwood · Structure no. 000000000033587

Built
1889
136 years old, rebuilt 1994
Condition
Poor
inspected April 2023
Type
Truss - Thru
Steel
Length
90 ft
1 main span
Daily traffic
13
2023 count
Owner
County
County Highway Agency

About this bridge

T-421 (cty. Br. 2) over White Deer Hole Creek is a steel truss - thru carrying T-421 (cty. Br. 2) over White Deer Hole Creek in Union County, Pennsylvania. It was built in 1889 and reconstructed in 1994, so it is 136 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 13 vehicles a day, projected to reach 20 by 2045. The structure is 90 ft (27.4 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesT-421 (cty. Br. 2)
CrossesWhite Deer Hole Creek
Location0.25 Mi.S of Allenwood
RouteCity Street 0
CountyUnion County
StatePennsylvania
Coordinates41.10391, -76.898
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating20 US tons
Inventory rating12 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length90 ft (27.4 m)
Longest span86 ft (26.2 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deck12 ft (3.5 m)

Traffic and service

Average daily traffic13 (2023)
Projected traffic20 by 2045
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$118,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-421 (cty. Br. 2) over White Deer Hole Creek built?

It was built in 1889, making it 136 years old in 2025. It was reconstructed in 1994.

What condition is T-421 (cty. Br. 2) over White Deer Hole 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 April 2023.

How much traffic does T-421 (cty. Br. 2) over White Deer Hole Creek carry?

About 13 vehicles per day (2023 count).

How long is T-421 (cty. Br. 2) over White Deer Hole Creek?

The structure is 90 ft (27.4 m) long with a longest span of 86 ft (26.2 m) and a deck 16 ft wide.

Who owns T-421 (cty. Br. 2) over White Deer Hole Creek?

It is owned by the County Highway Agency.