US Bridges

Nfa A509 over Machine Branch

Fair

Sevier County, Tennessee · 5.4 M SE of VS321-VS441VC · Structure no. 780A5090007

Built
1987
38 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
210
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A509 over Machine Branch is a concrete continuous culvert carrying Nfa A509 over Machine Branch in Sevier County, Tennessee. It was built in 1987, so it is 38 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 210 vehicles a day, roughly 2% of them trucks, projected to reach 336 by 2041. The structure is 26 ft (7.9 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A509
CrossesMachine Branch
Location5.4 M SE of VS321-VS441VC
RouteCounty Highway 509
CountySevier County
StateTennessee
Coordinates35.73717, -83.61982
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2020)
Projected traffic336 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 A509 over Machine Branch built?

It was built in 1987, making it 38 years old in 2025.

What condition is Nfa A509 over Machine Branch 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 A509 over Machine Branch carry?

About 210 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A509 over Machine Branch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 26 ft wide.

Who owns Nfa A509 over Machine Branch?

It is owned by the County Highway Agency.