US Bridges

Nbl Route I-81 over RTE 793

Fair

Washington County, Virginia · 1.37 Fr. 75; 1.15 to 11 · Structure no. 000000000018952

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Frame
Concrete
Length
23 ft
1 main span
Daily traffic
20,902
2022 count
Owner
State
State Highway Agency

About this bridge

Nbl Route I-81 over RTE 793 is a concrete frame carrying Nbl Route I-81 over RTE 793 in Washington County, Virginia. It was built in 1961, 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 20,902 vehicles a day, roughly 1% of them trucks, projected to reach 30,517 by 2042. The structure is 23 ft (7 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNbl Route I-81
CrossesRTE 793
Location1.37 Fr. 75; 1.15 to 11
RouteInterstate 81
CountyWashington County
StateVirginia
Coordinates36.70599, -81.95242
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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
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 geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating39 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,902 (2022)
Projected traffic30,517 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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$65 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nbl Route I-81 over RTE 793 built?

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

What condition is Nbl Route I-81 over RTE 793 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 Nbl Route I-81 over RTE 793 carry?

About 20,902 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Nbl Route I-81 over RTE 793?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 44 ft wide.

Who owns Nbl Route I-81 over RTE 793?

It is owned by the State Highway Agency.