US Bridges

Lost Mtn. RD./670 over Little Back Creek

Good

Roanoke County, Virginia · 0.01-RT694; 0.51-DEAD End · Structure no. 000000000025407

Built
1998
27 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
64
2018 count
Owner
State
State Highway Agency

About this bridge

Lost Mtn. RD./670 over Little Back Creek is a concrete culvert carrying Lost Mtn. RD./670 over Little Back Creek in Roanoke County, Virginia. It was built in 1998, so it is 27 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 64 vehicles a day, projected to reach 66 by 2042. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLost Mtn. RD./670
CrossesLittle Back Creek
Location0.01-RT694; 0.51-DEAD End
RouteCounty Highway 670
Coordinates37.21003, -80.08245
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length32 ft (9.8 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2018)
Projected traffic66 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Lost Mtn. RD./670 over Little Back Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is Lost Mtn. RD./670 over Little Back Creek 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 May 2024.

How much traffic does Lost Mtn. RD./670 over Little Back Creek carry?

About 64 vehicles per day (2018 count).

How long is Lost Mtn. RD./670 over Little Back Creek?

The structure is 32 ft (9.8 m) long with a longest span of 11 ft (3.4 m).

Who owns Lost Mtn. RD./670 over Little Back Creek?

It is owned by the State Highway Agency.