US Bridges

81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp

Fair

Roanoke County, Virginia · 0.18-SBL 81; 1.07-RT117 · Structure no. 000000000014893

Built
1963
62 years old, rebuilt 1990
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
160 ft
3 main spans
Daily traffic
4,401
2022 count
Owner
State
State Highway Agency

About this bridge

81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp is a steel stringer/multi-beam or girder carrying 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp in Roanoke County, Virginia. It was built in 1963 and reconstructed in 1990, 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 4,401 vehicles a day, roughly 1% of them trucks, projected to reach 6,425 by 2045. The structure is 160 ft (48.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries81SB Rp to 581 Sbl
CrossesUndr 81NB & Ovr 581SB Rp
Location0.18-SBL 81; 1.07-RT117
RouteInterstate 81
Coordinates37.34088, -79.99769
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating47 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length160 ft (48.8 m)
Longest span56 ft (17.1 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic4,401 (2022)
Projected traffic6,425 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$169.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1990.

What condition is 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp 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 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp carry?

About 4,401 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp?

The structure is 160 ft (48.8 m) long with a longest span of 56 ft (17.1 m) and a deck 44 ft wide.

Who owns 81SB Rp to 581 Sbl over Undr 81NB & Ovr 581SB Rp?

It is owned by the State Highway Agency.