US Bridges

Nfa A863 over Nine Mile Creek

FairPosted for load

Blount County, Tennessee · 14.5 M. Sw. Maryville. · Structure no. 050A8630001

Built
1915
110 years old
Condition
Fair
inspected December 2023
Type
Arch - Deck
Concrete
Length
99 ft
2 main spans
Daily traffic
350
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A863 over Nine Mile Creek is a concrete arch - deck carrying Nfa A863 over Nine Mile Creek in Blount County, Tennessee. It was built in 1915, so it is 110 years old, older 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. Its operating status is: posted for load restriction.

It carries about 350 vehicles a day, roughly 2% of them trucks, projected to reach 560 by 2042. The structure is 99 ft (30.3 m) long and 14 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNfa A863
CrossesNine Mile Creek
Location14.5 M. Sw. Maryville.
RouteCounty Highway 863
CountyBlount County
StateTennessee
Coordinates35.60595, -84.15018
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length99 ft (30.3 m)
Longest span44 ft (13.4 m)
Deck width14 ft (4.2 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2020)
Projected traffic560 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A863 over Nine Mile Creek built?

It was built in 1915, making it 110 years old in 2025.

What condition is Nfa A863 over Nine Mile 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 2023.

How much traffic does Nfa A863 over Nine Mile Creek carry?

About 350 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A863 over Nine Mile Creek?

The structure is 99 ft (30.3 m) long with a longest span of 44 ft (13.4 m) and a deck 14 ft wide.

Who owns Nfa A863 over Nine Mile Creek?

It is owned by the County Highway Agency.