US Bridges

Nfa A717 (sa 3709) over Louderback Creek

Fair

Hawkins County, Tennessee · 2.6 M SW of SR66-SR70 JCT · Structure no. 370A7170003

Built
1984
41 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
35 ft
2 main spans
Daily traffic
180
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A717 (sa 3709) over Louderback Creek is a prestressed concrete box beam or girders - multiple carrying Nfa A717 (sa 3709) over Louderback Creek in Hawkins County, Tennessee. It was built in 1984, so it is 41 years old, younger than the Tennessee average of 47.4 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 180 vehicles a day, roughly 2% of them trucks, projected to reach 288 by 2042. The structure is 35 ft (10.8 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa A717 (sa 3709)
CrossesLouderback Creek
Location2.6 M SW of SR66-SR70 JCT
RouteCounty Highway 717
CountyHawkins County
StateTennessee
Coordinates36.33568, -82.97925
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length35 ft (10.8 m)
Longest span17 ft (5.2 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2020)
Projected traffic288 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 A717 (sa 3709) over Louderback Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa A717 (sa 3709) over Louderback Creek 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 June 2023.

How much traffic does Nfa A717 (sa 3709) over Louderback Creek carry?

About 180 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A717 (sa 3709) over Louderback Creek?

The structure is 35 ft (10.8 m) long with a longest span of 17 ft (5.2 m) and a deck 28 ft wide.

Who owns Nfa A717 (sa 3709) over Louderback Creek?

It is owned by the County Highway Agency.