US Bridges

T-646 over Pa Tpk (I-76)

Fair

Cumberland County, Pennsylvania · Lower Allen Twp · Structure no. 000000000014035

Built
1950
75 years old
Condition
Fair
inspected February 2023
Type
Girder and Floorbeam System
Steel
Length
89 ft
1 main span
Daily traffic
200
2002 count
Owner
Toll Authority
State Toll Authority

About this bridge

T-646 over Pa Tpk (I-76) is a steel girder and floorbeam system carrying T-646 over Pa Tpk (I-76) in Cumberland County, Pennsylvania. It was built in 1950, so it is 75 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 4% of them trucks, projected to reach 280 by 2030. The structure is 89 ft (27.1 m) long and 29 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)
LocationLower Allen Twp
RouteCity Street 0
CountyCumberland County
StatePennsylvania
Coordinates40.19571, -76.92471
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length89 ft (27.1 m)
Longest span84 ft (25.6 m)
Deck width29 ft (8.8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2002)
Projected traffic280 by 2030
Trucks4%
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$99,000
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1950, making it 75 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 February 2023.

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

About 200 vehicles per day (2002 count), of which roughly 4% are trucks.

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

The structure is 89 ft (27.1 m) long with a longest span of 84 ft (25.6 m) and a deck 29 ft wide.

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

It is owned by the State Toll Authority.