US Bridges

T-646 over Pa Tpk (I-76)

Fair

Lancaster County, Pennsylvania · Clay Twp · Structure no. 000000000021778

Built
1949
76 years old
Condition
Fair
inspected April 2023
Type
Frame
Concrete
Length
87 ft
1 main span
Daily traffic
200
1992 count
Owner
Toll Authority
State Toll Authority

About this bridge

T-646 over Pa Tpk (I-76) is a concrete frame carrying T-646 over Pa Tpk (I-76) in Lancaster County, Pennsylvania. It was built in 1949, so it is 76 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 200 vehicles a day, roughly 6% of them trucks, projected to reach 315 by 2030. The structure is 87 ft (26.5 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesT-646
CrossesPa Tpk (I-76)
LocationClay Twp
RouteCity Street 0
CountyLancaster County
StatePennsylvania
Coordinates40.24478, -76.22756
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span78 ft (23.8 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (1992)
Projected traffic315 by 2030
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$78,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was T-646 over Pa Tpk (I-76) built?

It was built in 1949, making it 76 years old in 2025.

What condition is T-646 over Pa Tpk (I-76) 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 April 2023.

How much traffic does T-646 over Pa Tpk (I-76) carry?

About 200 vehicles per day (1992 count), of which roughly 6% are trucks.

How long is T-646 over Pa Tpk (I-76)?

The structure is 87 ft (26.5 m) long with a longest span of 78 ft (23.8 m) and a deck 23 ft wide.

Who owns T-646 over Pa Tpk (I-76)?

It is owned by the State Toll Authority.