US Bridges

I-81 Nbl over Ninninger Rd.

Fair

Washington County, Virginia · 2.99FR TENN.LN;2.56 to 11 · Structure no. 000000000020020

Built
1961
64 years old, rebuilt 1997
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
133 ft
3 main spans
Daily traffic
23,016
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Nbl over Ninninger Rd. is a prestressed concrete stringer/multi-beam or girder carrying I-81 Nbl over Ninninger Rd. in Washington County, Virginia. It was built in 1961 and reconstructed in 1997, so it is 64 years old, older than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 23,016 vehicles a day, roughly 1% of them trucks, projected to reach 27,635 by 2045. The structure is 133 ft (40.5 m) long and 63 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesI-81 Nbl
CrossesNinninger Rd.
Location2.99FR TENN.LN;2.56 to 11
RouteInterstate 81
CountyWashington County
StateVirginia
Coordinates36.61654, -82.19739
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length133 ft (40.5 m)
Longest span45 ft (13.7 m)
Deck width63 ft (19.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,016 (2022)
Projected traffic27,635 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 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$65 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Nbl over Ninninger Rd. built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1997.

What condition is I-81 Nbl over Ninninger Rd. 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 2023.

How much traffic does I-81 Nbl over Ninninger Rd. carry?

About 23,016 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81 Nbl over Ninninger Rd.?

The structure is 133 ft (40.5 m) long with a longest span of 45 ft (13.7 m) and a deck 63 ft wide.

Who owns I-81 Nbl over Ninninger Rd.?

It is owned by the State Highway Agency.