US Bridges

I-81 Nbl over Route 75

Fair

Washington County, Virginia · 2.15 Fr. 647; 2.52 to 11. · Structure no. 000000000022397

Built
1961
64 years old, rebuilt 1993
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
137 ft
3 main spans
Daily traffic
25,393
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Nbl over Route 75 is a concrete tee beam carrying I-81 Nbl over Route 75 in Washington County, Virginia. It was built in 1961 and reconstructed in 1993, 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 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 25,393 vehicles a day, roughly 22% of them trucks, projected to reach 27,315 by 2042. The structure is 137 ft (41.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-81 Nbl
CrossesRoute 75
Location2.15 Fr. 647; 2.52 to 11.
RouteInterstate 81
Coordinates36.6995, -81.97479
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating28 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length137 ft (41.9 m)
Longest span46 ft (13.9 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,393 (2022)
Projected traffic27,315 by 2042
Trucks22%
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Nbl over Route 75 built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1993.

What condition is I-81 Nbl over Route 75 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 2024.

How much traffic does I-81 Nbl over Route 75 carry?

About 25,393 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is I-81 Nbl over Route 75?

The structure is 137 ft (41.9 m) long with a longest span of 46 ft (13.9 m) and a deck 44 ft wide.

Who owns I-81 Nbl over Route 75?

It is owned by the State Highway Agency.