US Bridges

Nfa 1178 (sa 6710) over Flat Creek

FairPosted for load

Overton County, Tennessee · 3 MI North of SR85 · Structure no. 67F00010001

Built
1940
85 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
545
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1178 (sa 6710) over Flat Creek is a steel stringer/multi-beam or girder carrying Nfa 1178 (sa 6710) over Flat Creek in Overton County, Tennessee. It was built in 1940, so it is 85 years old, older 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. Its operating status is: posted for load restriction.

It carries about 545 vehicles a day, roughly 3% of them trucks, projected to reach 1,472 by 2041. The structure is 44 ft (13.3 m) long and 21 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1178 (sa 6710)
CrossesFlat Creek
Location3 MI North of SR85
RouteCounty Highway 1178
CountyOverton County
StateTennessee
Coordinates36.41168, -85.37493
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.3 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length44 ft (13.3 m)
Longest span44 ft (13.3 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic545 (2021)
Projected traffic1,472 by 2041
Trucks3%
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$215,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1178 (sa 6710) over Flat Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is Nfa 1178 (sa 6710) over Flat 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 December 2024.

How much traffic does Nfa 1178 (sa 6710) over Flat Creek carry?

About 545 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1178 (sa 6710) over Flat Creek?

The structure is 44 ft (13.3 m) long with a longest span of 44 ft (13.3 m) and a deck 21 ft wide.

Who owns Nfa 1178 (sa 6710) over Flat Creek?

It is owned by the County Highway Agency.