US Bridges

I-81 Sbl Ramp B over Warm Run

Fair

Rockbridge County, Virginia · .11 to 81SBL & 1.04 to 11 · Structure no. 000000000015341

Built
1976
49 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
1,082
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Sbl Ramp B over Warm Run is a concrete culvert carrying I-81 Sbl Ramp B over Warm Run in Rockbridge County, Virginia. It was built in 1976, so it is 49 years old, younger 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 1,082 vehicles a day, roughly 1% of them trucks, projected to reach 1,580 by 2045. The structure is 27 ft (8.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-81 Sbl Ramp B
CrossesWarm Run
Location.11 to 81SBL & 1.04 to 11
RouteInterstate 81
CountyRockbridge County
StateVirginia
Coordinates37.79207, -79.39963
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,082 (2022)
Projected traffic1,580 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$75 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-81 Sbl Ramp B over Warm Run built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-81 Sbl Ramp B over Warm Run 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 Sbl Ramp B over Warm Run carry?

About 1,082 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81 Sbl Ramp B over Warm Run?

The structure is 27 ft (8.1 m) long with a longest span of 13 ft (3.9 m).

Who owns I-81 Sbl Ramp B over Warm Run?

It is owned by the State Highway Agency.