US Bridges

Route 643 over Mud Fork

Fair

Tazewell County, Virginia · 1.40 M to 702& .55 FR 685 · Structure no. 000000000018612

Built
1973
52 years old, rebuilt 2008
Condition
Fair
inspected July 2024
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
151
2015 count
Owner
State
State Highway Agency

About this bridge

Route 643 over Mud Fork is a concrete slab carrying Route 643 over Mud Fork in Tazewell County, Virginia. It was built in 1973 and reconstructed in 2008, so it is 52 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 151 vehicles a day, projected to reach 227 by 2042. The structure is 25 ft (7.6 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesRoute 643
CrossesMud Fork
Location1.40 M to 702& .55 FR 685
RouteCounty Highway 643
Coordinates37.25713, -81.35853
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.9 US tons
Inventory rating59 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic151 (2015)
Projected traffic227 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 643 over Mud Fork built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2008.

What condition is Route 643 over Mud Fork 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 July 2024.

How much traffic does Route 643 over Mud Fork carry?

About 151 vehicles per day (2015 count).

How long is Route 643 over Mud Fork?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 20 ft wide.

Who owns Route 643 over Mud Fork?

It is owned by the State Highway Agency.