US Bridges

Nfa A450 over Carter Branch

Good

Macon County, Tennessee · 6 M SW of Lafayette · Structure no. 560A4500005

Built
1986
39 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
46 ft
2 main spans
Daily traffic
190
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A450 over Carter Branch is a concrete continuous culvert carrying Nfa A450 over Carter Branch in Macon County, Tennessee. It was built in 1986, so it is 39 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 190 vehicles a day, roughly 4% of them trucks, projected to reach 304 by 2042. The structure is 46 ft (14 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesNfa A450
CrossesCarter Branch
Location6 M SW of Lafayette
RouteCounty Highway 450
CountyMacon County
StateTennessee
Coordinates36.44712, -86.08154
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 inspectionSeptember 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 rating99.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length46 ft (14 m)
Longest span15 ft (4.6 m)
Deck width26 ft (8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2020)
Projected traffic304 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 A450 over Carter Branch built?

It was built in 1986, making it 39 years old in 2025.

What condition is Nfa A450 over Carter 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 September 2023.

How much traffic does Nfa A450 over Carter Branch carry?

About 190 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Nfa A450 over Carter Branch?

The structure is 46 ft (14 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Nfa A450 over Carter Branch?

It is owned by the County Highway Agency.