US Bridges

Liberty Hill Rd. over Knob Fork Creek

Fair

Grayson County, Virginia · 0.30 to 760; 0.20 to 805 · Structure no. 000000000008936

Built
1972
53 years old, rebuilt 2007
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
104
2022 count
Owner
State
State Highway Agency

About this bridge

Liberty Hill Rd. over Knob Fork Creek is a steel stringer/multi-beam or girder carrying Liberty Hill Rd. over Knob Fork Creek in Grayson County, Virginia. It was built in 1972 and reconstructed in 2007, so it is 53 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 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 104 vehicles a day, projected to reach 118 by 2045. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesLiberty Hill Rd.
CrossesKnob Fork Creek
Location0.30 to 760; 0.20 to 805
RouteCounty Highway 777
CountyGrayson County
StateVirginia
Coordinates36.73392, -81.06933
Functional classRural Local

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length32 ft (9.8 m)
Longest span29 ft (8.7 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104 (2022)
Projected traffic118 by 2045
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

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$113.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Liberty Hill Rd. over Knob Fork Creek built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2007.

What condition is Liberty Hill Rd. over Knob Fork Creek 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 October 2023.

How much traffic does Liberty Hill Rd. over Knob Fork Creek carry?

About 104 vehicles per day (2022 count).

How long is Liberty Hill Rd. over Knob Fork Creek?

The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.7 m) and a deck 22 ft wide.

Who owns Liberty Hill Rd. over Knob Fork Creek?

It is owned by the State Highway Agency.