US Bridges

I-81 Sbl over N Fork Shenandoah River

Fair

Shenandoah County, Virginia · 0.37 FR 730 - 3.68 to 211 · Structure no. 000000000017014

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
671 ft
11 main spans
Daily traffic
24,158
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Sbl over N Fork Shenandoah River is a prestressed concrete stringer/multi-beam or girder carrying I-81 Sbl over N Fork Shenandoah River in Shenandoah County, Virginia. It was built in 1966, so it is 59 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 24,158 vehicles a day, roughly 27% of them trucks, projected to reach 25,100 by 2042. The structure is 671 ft (204.5 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-81 Sbl
CrossesN Fork Shenandoah River
Location0.37 FR 730 - 3.68 to 211
RouteInterstate 81
Coordinates38.69874, -78.65549
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating91.1 US tons
Inventory rating58 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length671 ft (204.5 m)
Longest span61 ft (18.6 m)
Deck width34 ft (10.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,158 (2022)
Projected traffic25,100 by 2042
Trucks27%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$620 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-81 Sbl over N Fork Shenandoah River built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-81 Sbl over N Fork Shenandoah River 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 August 2024.

How much traffic does I-81 Sbl over N Fork Shenandoah River carry?

About 24,158 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is I-81 Sbl over N Fork Shenandoah River?

The structure is 671 ft (204.5 m) long with a longest span of 61 ft (18.6 m) and a deck 34 ft wide.

Who owns I-81 Sbl over N Fork Shenandoah River?

It is owned by the State Highway Agency.