US Bridges

Route 670 over S Fork Holston River

Fair

Smyth County, Virginia · 2.68 to R672& .82 to R601 · Structure no. 000000000026720

Built
2000
25 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
83 ft
3 main spans
Daily traffic
239
2022 count
Owner
State
State Highway Agency

About this bridge

Route 670 over S Fork Holston River is a concrete slab carrying Route 670 over S Fork Holston River in Smyth County, Virginia. It was built in 2000, so it is 25 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 239 vehicles a day, roughly 2% of them trucks, projected to reach 266 by 2045. The structure is 83 ft (25.3 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRoute 670
CrossesS Fork Holston River
Location2.68 to R672& .82 to R601
RouteCounty Highway 670
CountySmyth County
StateVirginia
Coordinates36.77271, -81.4669
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating99 US tons
Inventory rating98 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length83 ft (25.3 m)
Longest span27 ft (8.2 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic239 (2022)
Projected traffic266 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 670 over S Fork Holston River built?

It was built in 2000, making it 25 years old in 2025.

What condition is Route 670 over S Fork Holston 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 March 2023.

How much traffic does Route 670 over S Fork Holston River carry?

About 239 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Route 670 over S Fork Holston River?

The structure is 83 ft (25.3 m) long with a longest span of 27 ft (8.2 m) and a deck 27 ft wide.

Who owns Route 670 over S Fork Holston River?

It is owned by the State Highway Agency.