US Bridges

I-81 Sbl over Ninninger Rd.

Fair

Washington County, Virginia · 2.99MTOTN. & 2.55M to 11 · Structure no. 000000000020018

Built
1961
64 years old, rebuilt 1997
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
157 ft
3 main spans
Daily traffic
22,477
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Sbl over Ninninger Rd. is a prestressed concrete stringer/multi-beam or girder carrying I-81 Sbl 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 22,477 vehicles a day, roughly 1% of them trucks, projected to reach 26,325 by 2045. The structure is 157 ft (47.9 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 Sbl
CrossesNinninger Rd.
Location2.99MTOTN. & 2.55M to 11
RouteInterstate 81
CountyWashington County
StateVirginia
Coordinates36.61707, -82.19782
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.
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 rating79 US tons
Inventory rating61 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span53 ft (16.2 m)
Deck width63 ft (19.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,477 (2022)
Projected traffic26,325 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 Sbl 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 Sbl 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 Sbl over Ninninger Rd. carry?

About 22,477 vehicles per day (2022 count), of which roughly 1% are trucks.

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

The structure is 157 ft (47.9 m) long with a longest span of 53 ft (16.2 m) and a deck 63 ft wide.

Who owns I-81 Sbl over Ninninger Rd.?

It is owned by the State Highway Agency.