US Bridges

Nfa A309 over North Indian Creek

Good

Unicoi County, Tennessee · Near Unicoi W. of SR 36 · Structure no. 860A3090001

Built
1995
30 years old
Condition
Good
inspected July 2024
Type
Culvert
Concrete Continuous
Length
48 ft
3 main spans
Daily traffic
130
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A309 over North Indian Creek is a concrete continuous culvert carrying Nfa A309 over North Indian Creek in Unicoi County, Tennessee. It was built in 1995, so it is 30 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 130 vehicles a day, roughly 6% of them trucks, projected to reach 208 by 2040. The structure is 48 ft (14.7 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A309
CrossesNorth Indian Creek
LocationNear Unicoi W. of SR 36
RouteCounty Highway 309
CountyUnicoi County
StateTennessee
Coordinates36.1922, -82.37275
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length48 ft (14.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2020)
Projected traffic208 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$83,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A309 over North Indian Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Nfa A309 over North Indian 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 2024.

How much traffic does Nfa A309 over North Indian Creek carry?

About 130 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Nfa A309 over North Indian Creek?

The structure is 48 ft (14.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns Nfa A309 over North Indian Creek?

It is owned by the County Highway Agency.