US Bridges

Nfa A860 over Nine Mile Creek

Good

Blount County, Tennessee · 13. 5M. Sw. Maryville · Structure no. 050A8600001

Built
1986
39 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
150 ft
4 main spans
Daily traffic
280
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A860 over Nine Mile Creek is a prestressed concrete box beam or girders - single or spread carrying Nfa A860 over Nine Mile Creek in Blount 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 280 vehicles a day, roughly 2% of them trucks, projected to reach 448 by 2042. The structure is 150 ft (45.7 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa A860
CrossesNine Mile Creek
Location13. 5M. Sw. Maryville
RouteCounty Highway 860
Coordinates35.60638, -84.09727
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating65.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span38 ft (11.5 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2020)
Projected traffic448 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 A860 over Nine Mile Creek built?

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

What condition is Nfa A860 over Nine Mile 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 January 2024.

How much traffic does Nfa A860 over Nine Mile Creek carry?

About 280 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A860 over Nine Mile Creek?

The structure is 150 ft (45.7 m) long with a longest span of 38 ft (11.5 m) and a deck 26 ft wide.

Who owns Nfa A860 over Nine Mile Creek?

It is owned by the County Highway Agency.