US Bridges

I-81 Nb; SR 0081 over 1011 Lambs Gap

Fair

Cumberland County, Pennsylvania · 1 Mi.S. Mount Zion · Structure no. 000000000013705

Built
1973
52 years old, rebuilt 2017
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
164 ft
3 main spans
Daily traffic
36,598
2024 count
Owner
State
State Highway Agency

About this bridge

I-81 Nb; SR 0081 over 1011 Lambs Gap is a prestressed concrete stringer/multi-beam or girder carrying I-81 Nb; SR 0081 over 1011 Lambs Gap in Cumberland County, Pennsylvania. It was built in 1973 and reconstructed in 2017, so it is 52 years old, younger 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 36,598 vehicles a day, roughly 24% of them trucks, projected to reach 51,255 by 2032. The structure is 164 ft (50 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-81 Nb; SR 0081
Crosses1011 Lambs Gap
Location1 Mi.S. Mount Zion
RouteInterstate 81
CountyCumberland County
StatePennsylvania
Coordinates40.27378, -77.00767
Functional classUrban Principal Arterial - Interstate

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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length164 ft (50 m)
Longest span87 ft (26.5 m)
Deck width55 ft (16.9 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,598 (2024)
Projected traffic51,255 by 2032
Trucks24%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Nb; SR 0081 over 1011 Lambs Gap built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2017.

What condition is I-81 Nb; SR 0081 over 1011 Lambs Gap 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 May 2024.

How much traffic does I-81 Nb; SR 0081 over 1011 Lambs Gap carry?

About 36,598 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is I-81 Nb; SR 0081 over 1011 Lambs Gap?

The structure is 164 ft (50 m) long with a longest span of 87 ft (26.5 m) and a deck 55 ft wide.

Who owns I-81 Nb; SR 0081 over 1011 Lambs Gap?

It is owned by the State Highway Agency.