US Bridges

Nfa A509 over Mill Creek

Good

Sevier County, Tennessee · Just SW of Pigeon Forge · Structure no. 780A5090001

Built
1984
41 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete Continuous
Length
48 ft
3 main spans
Daily traffic
210
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A509 over Mill Creek is a concrete continuous culvert carrying Nfa A509 over Mill Creek in Sevier County, Tennessee. It was built in 1984, so it is 41 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 210 vehicles a day, roughly 2% of them trucks, projected to reach 336 by 2041. The structure is 48 ft (14.6 m) long and 27 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesNfa A509
CrossesMill Creek
LocationJust SW of Pigeon Forge
RouteCounty Highway 509
Coordinates35.76905, -83.54712
Functional classUrban 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 inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length48 ft (14.6 m)
Longest span12 ft (3.7 m)
Deck width27 ft (8.2 m)
Roadway width21 ft (6.5 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 closed9.9 mi (16 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 Mill Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa A509 over Mill Creek 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 July 2023.

How much traffic does Nfa A509 over Mill Creek carry?

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

How long is Nfa A509 over Mill Creek?

The structure is 48 ft (14.6 m) long with a longest span of 12 ft (3.7 m) and a deck 27 ft wide.

Who owns Nfa A509 over Mill Creek?

It is owned by the County Highway Agency.