US Bridges

Nfa A143 over Dog Branch

Good

Warren County, Tennessee · 6 MI East of Cannon CO LN · Structure no. 890A1430003

Built
1992
33 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
49 ft
1 main span
Daily traffic
150
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A143 over Dog Branch is a prestressed concrete box beam or girders - single or spread carrying Nfa A143 over Dog Branch in Warren County, Tennessee. It was built in 1992, so it is 33 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 150 vehicles a day, roughly 2% of them trucks, projected to reach 240 by 2042. The structure is 49 ft (14.9 m) long and 24 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesNfa A143
CrossesDog Branch
Location6 MI East of Cannon CO LN
RouteCounty Highway 143
Coordinates35.67661, -85.90267
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span49 ft (14.9 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2020)
Projected traffic240 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 A143 over Dog Branch built?

It was built in 1992, making it 33 years old in 2025.

What condition is Nfa A143 over Dog Branch 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 2023.

How much traffic does Nfa A143 over Dog Branch carry?

About 150 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A143 over Dog Branch?

The structure is 49 ft (14.9 m) long with a longest span of 49 ft (14.9 m) and a deck 24 ft wide.

Who owns Nfa A143 over Dog Branch?

It is owned by the County Highway Agency.