US Bridges

I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd.

Poor

Cumberland County, Pennsylvania · 6 Mi.S. Carlisle · Structure no. 000000000013653

Built
1963
62 years old
Condition
Poor
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
135 ft
3 main spans
Daily traffic
20,917
2024 count
Owner
State
State Highway Agency

About this bridge

I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd. is a prestressed concrete box beam or girders - multiple carrying I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd. in Cumberland County, Pennsylvania. It was built in 1963, so it is 62 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.

It carries about 20,917 vehicles a day, roughly 36% of them trucks, projected to reach 28,129 by 2032. The structure is 135 ft (41.1 m) long and 46 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-81 Nb; SR 0081
CrossesSR 3015; Mt. Rock Rd.
Location6 Mi.S. Carlisle
RouteInterstate 81
CountyCumberland County
StatePennsylvania
Coordinates40.14838, -77.31316
Functional classRural Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating38 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span43 ft (13.1 m)
Deck width46 ft (13.9 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,917 (2024)
Projected traffic28,129 by 2032
Trucks36%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$421,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd. built?

It was built in 1963, making it 62 years old in 2025.

What condition is I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd. 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 February 2024.

How much traffic does I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd. carry?

About 20,917 vehicles per day (2024 count), of which roughly 36% are trucks.

How long is I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd.?

The structure is 135 ft (41.1 m) long with a longest span of 43 ft (13.1 m) and a deck 46 ft wide.

Who owns I-81 Nb; SR 0081 over SR 3015; Mt. Rock Rd.?

It is owned by the State Highway Agency.