US Bridges

RTE 670 over S.F. Holston River

Good

Smyth County, Virginia · 1.02MTO601 & 2.48MTO672 · Structure no. 000000000029600

Built
2013
12 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete
Length
67 ft
2 main spans
Daily traffic
239
2022 count
Owner
State
State Highway Agency

About this bridge

RTE 670 over S.F. Holston River is a concrete slab carrying RTE 670 over S.F. Holston River in Smyth County, Virginia. It was built in 2013, so it is 12 years old, younger than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 239 vehicles a day, roughly 2% of them trucks, projected to reach 266 by 2045. The structure is 67 ft (20.4 m) long and 26 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesRTE 670
CrossesS.F. Holston River
Location1.02MTO601 & 2.48MTO672
RouteCounty Highway 670
CountySmyth County
StateVirginia
Coordinates36.77148, -81.46994
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating53 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length67 ft (20.4 m)
Longest span31 ft (9.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.2 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 closed29.8 mi (48 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 RTE 670 over S.F. Holston River built?

It was built in 2013, making it 12 years old in 2025.

What condition is RTE 670 over S.F. Holston River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does RTE 670 over S.F. Holston River carry?

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

How long is RTE 670 over S.F. Holston River?

The structure is 67 ft (20.4 m) long with a longest span of 31 ft (9.6 m) and a deck 26 ft wide.

Who owns RTE 670 over S.F. Holston River?

It is owned by the State Highway Agency.