US Bridges

81 Sbl over Br. N Fork Roanoke River

Fair

Montgomery County, Virginia · 9.50 Rt 11; 0.4 Rt 603 · Structure no. 000000000012149

Built
1968
57 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
22 ft
3 main spans
Daily traffic
25,907
2022 count
Owner
State
State Highway Agency

About this bridge

81 Sbl over Br. N Fork Roanoke River is a concrete culvert carrying 81 Sbl over Br. N Fork Roanoke River in Montgomery County, Virginia. It was built in 1968, so it is 57 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 25,907 vehicles a day, roughly 1% of them trucks, projected to reach 28,886 by 2045. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
Carries81 Sbl
CrossesBr. N Fork Roanoke River
Location9.50 Rt 11; 0.4 Rt 603
RouteInterstate 81
CountyMontgomery County
StateVirginia
Coordinates37.22875, -80.24277
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,907 (2022)
Projected traffic28,886 by 2045
Trucks1%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$133.8 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 81 Sbl over Br. N Fork Roanoke River built?

It was built in 1968, making it 57 years old in 2025.

What condition is 81 Sbl over Br. N Fork Roanoke River 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 April 2023.

How much traffic does 81 Sbl over Br. N Fork Roanoke River carry?

About 25,907 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 81 Sbl over Br. N Fork Roanoke River?

The structure is 22 ft (6.7 m) long with a longest span of 7 ft (2.1 m).

Who owns 81 Sbl over Br. N Fork Roanoke River?

It is owned by the State Highway Agency.