US Bridges

I-81 Sbl over Bonham Road

Fair

Washington County, Virginia · .61MI RT.658 &1.3MI RT.11 · Structure no. 000000000025456

Built
2001
24 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
102 ft
1 main span
Daily traffic
26,330
2022 count
Owner
State
State Highway Agency

About this bridge

I-81 Sbl over Bonham Road is a steel stringer/multi-beam or girder carrying I-81 Sbl over Bonham Road in Washington County, Virginia. It was built in 2001, so it is 24 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 26,330 vehicles a day, roughly 1% of them trucks, projected to reach 33,065 by 2045. The structure is 102 ft (31.2 m) long and 62 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-81 Sbl
CrossesBonham Road
Location.61MI RT.658 &1.3MI RT.11
RouteInterstate 81
CountyWashington County
StateVirginia
Coordinates36.62636, -82.13144
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating108 US tons
Inventory rating83 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length102 ft (31.2 m)
Longest span100 ft (30.5 m)
Deck width62 ft (18.8 m)
Roadway width59 ft (17.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,330 (2022)
Projected traffic33,065 by 2045
Trucks1%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81 Sbl over Bonham Road built?

It was built in 2001, making it 24 years old in 2025.

What condition is I-81 Sbl over Bonham Road 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 June 2023.

How much traffic does I-81 Sbl over Bonham Road carry?

About 26,330 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81 Sbl over Bonham Road?

The structure is 102 ft (31.2 m) long with a longest span of 100 ft (30.5 m) and a deck 62 ft wide.

Who owns I-81 Sbl over Bonham Road?

It is owned by the State Highway Agency.