US Bridges

I-81 Sbl over Narrow Passage Creek

Fair

Shenandoah County, Virginia · 2.15 to 185 - 1.86 to 42 · Structure no. 000000000017036

Built
1966
59 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
343 ft
5 main spans
Daily traffic
23,303
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Sbl over Narrow Passage Creek is a prestressed concrete stringer/multi-beam or girder carrying I-81 Sbl over Narrow Passage Creek 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 23,303 vehicles a day, roughly 1% of them trucks, projected to reach 31,084 by 2045. The structure is 343 ft (104.5 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-81 Sbl
CrossesNarrow Passage Creek
Location2.15 to 185 - 1.86 to 42
RouteInterstate 81
Coordinates38.84982, -78.54605
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating55 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length343 ft (104.5 m)
Longest span69 ft (21 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,303 (2022)
Projected traffic31,084 by 2045
Trucks1%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$311 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-81 Sbl over Narrow Passage Creek built?

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

What condition is I-81 Sbl over Narrow Passage Creek 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 2023.

How much traffic does I-81 Sbl over Narrow Passage Creek carry?

About 23,303 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81 Sbl over Narrow Passage Creek?

The structure is 343 ft (104.5 m) long with a longest span of 69 ft (21 m) and a deck 35 ft wide.

Who owns I-81 Sbl over Narrow Passage Creek?

It is owned by the State Highway Agency.