US Bridges

Nfa A070 (sa 7711) over Big Brush Creek

Fair

Sequatchie County, Tennessee · .8 MI North of SR 8 · Structure no. 770A0700001

Built
1994
31 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
130 ft
3 main spans
Daily traffic
270
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A070 (sa 7711) over Big Brush Creek is a prestressed concrete continuous box beam or girders - single or spread carrying Nfa A070 (sa 7711) over Big Brush Creek in Sequatchie County, Tennessee. It was built in 1994, so it is 31 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 270 vehicles a day, roughly 10% of them trucks, projected to reach 432 by 2042. The structure is 130 ft (39.6 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A070 (sa 7711)
CrossesBig Brush Creek
Location.8 MI North of SR 8
RouteCounty Highway 70
CountySequatchie County
StateTennessee
Coordinates35.41387, -85.38094
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span45 ft (13.7 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2020)
Projected traffic432 by 2042
Trucks10%
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 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 Nfa A070 (sa 7711) over Big Brush Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Nfa A070 (sa 7711) over Big Brush 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 A070 (sa 7711) over Big Brush Creek carry?

About 270 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nfa A070 (sa 7711) over Big Brush Creek?

The structure is 130 ft (39.6 m) long with a longest span of 45 ft (13.7 m) and a deck 26 ft wide.

Who owns Nfa A070 (sa 7711) over Big Brush Creek?

It is owned by the County Highway Agency.