US Bridges

Nfa A368 over Helton Creek

Good

DeKalb County, Tennessee · .5MI West of US70 · Structure no. 210A3320001

Built
2007
18 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
160
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A368 over Helton Creek is a concrete continuous culvert carrying Nfa A368 over Helton Creek in DeKalb County, Tennessee. It was built in 2007, so it is 18 years old, younger than the Tennessee average of 47.4 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 160 vehicles a day, roughly 1% of them trucks, projected to reach 256 by 2040. The structure is 29 ft (8.7 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa A368
CrossesHelton Creek
Location.5MI West of US70
RouteCounty Highway 368
CountyDeKalb County
StateTennessee
Coordinates36.05642, -86.02467
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length29 ft (8.7 m)
Longest span14 ft (4.3 m)
Deck width28 ft (8.6 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2020)
Projected traffic256 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A368 over Helton Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is Nfa A368 over Helton 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 December 2023.

How much traffic does Nfa A368 over Helton Creek carry?

About 160 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A368 over Helton Creek?

The structure is 29 ft (8.7 m) long with a longest span of 14 ft (4.3 m) and a deck 28 ft wide.

Who owns Nfa A368 over Helton Creek?

It is owned by the County Highway Agency.