US Bridges

I-81 Nbl over Route 91

Fair

Washington County, Virginia · 2.99 Fr. 737; 2.66 to 11. · Structure no. 000000000018936

Built
1962
63 years old, rebuilt 1987
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
155 ft
3 main spans
Daily traffic
16,423
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Nbl over Route 91 is a prestressed concrete stringer/multi-beam or girder carrying I-81 Nbl over Route 91 in Washington County, Virginia. It was built in 1962 and reconstructed in 1987, so it is 63 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 6 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 16,423 vehicles a day, roughly 1% of them trucks, projected to reach 16,609 by 2042. The structure is 155 ft (47.2 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-81 Nbl
CrossesRoute 91
Location2.99 Fr. 737; 2.66 to 11.
RouteInterstate 81
Coordinates36.77176, -81.78122
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating50 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length155 ft (47.2 m)
Longest span63 ft (19.2 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,423 (2022)
Projected traffic16,609 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$221 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Nbl over Route 91 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1987.

What condition is I-81 Nbl over Route 91 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 June 2024.

How much traffic does I-81 Nbl over Route 91 carry?

About 16,423 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81 Nbl over Route 91?

The structure is 155 ft (47.2 m) long with a longest span of 63 ft (19.2 m) and a deck 44 ft wide.

Who owns I-81 Nbl over Route 91?

It is owned by the State Highway Agency.