US Bridges

Nbl Route 0081 over 81SB Ramp to 581SBL

Fair

Roanoke County, Virginia · 2.31-RT419; 3.43-BOTET CO · Structure no. 000000000014891

Built
1963
62 years old, rebuilt 1987
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
356 ft
5 main spans
Daily traffic
35,236
2022 count
Owner
State
State Highway Agency

About this bridge

Nbl Route 0081 over 81SB Ramp to 581SBL is a steel stringer/multi-beam or girder carrying Nbl Route 0081 over 81SB Ramp to 581SBL in Roanoke County, Virginia. It was built in 1963 and reconstructed in 1987, so it is 62 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 35,236 vehicles a day, roughly 1% of them trucks, projected to reach 42,383 by 2045. The structure is 356 ft (108.5 m) long and 37 ft wide.

Location

Open in Google Maps
CarriesNbl Route 0081
Crosses81SB Ramp to 581SBL
Location2.31-RT419; 3.43-BOTET CO
RouteInterstate 81
CountyRoanoke County
StateVirginia
Coordinates37.34037, -79.99841
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 inspectionMay 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length356 ft (108.5 m)
Longest span90 ft (27.5 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,236 (2022)
Projected traffic42,383 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$358.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nbl Route 0081 over 81SB Ramp to 581SBL built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1987.

What condition is Nbl Route 0081 over 81SB Ramp to 581SBL 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 2023.

How much traffic does Nbl Route 0081 over 81SB Ramp to 581SBL carry?

About 35,236 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Nbl Route 0081 over 81SB Ramp to 581SBL?

The structure is 356 ft (108.5 m) long with a longest span of 90 ft (27.5 m) and a deck 37 ft wide.

Who owns Nbl Route 0081 over 81SB Ramp to 581SBL?

It is owned by the State Highway Agency.