US Bridges

Nfa A307 over Roan Creek

Fair

Johnson County, Tennessee · S Off US421-SE of Mtn Cty · Structure no. 460A3070001

Built
1978
47 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
37 ft
3 main spans
Daily traffic
70
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A307 over Roan Creek is a concrete continuous culvert carrying Nfa A307 over Roan Creek in Johnson County, Tennessee. It was built in 1978, so it is 47 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 70 vehicles a day, roughly 5% of them trucks, projected to reach 112 by 2042. The structure is 37 ft (11.4 m) long and 19 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A307
CrossesRoan Creek
LocationS Off US421-SE of Mtn Cty
RouteCounty Highway 307
CountyJohnson County
StateTennessee
Coordinates36.42862, -81.7803
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length37 ft (11.4 m)
Longest span12 ft (3.7 m)
Deck width19 ft (5.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic112 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$217,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A307 over Roan Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Nfa A307 over Roan 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 April 2024.

How much traffic does Nfa A307 over Roan Creek carry?

About 70 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Nfa A307 over Roan Creek?

The structure is 37 ft (11.4 m) long with a longest span of 12 ft (3.7 m) and a deck 19 ft wide.

Who owns Nfa A307 over Roan Creek?

It is owned by the County Highway Agency.