US Bridges

Nfa A249 over Stone Branch

Fair

Johnson County, Tennessee · N Off US421-N of Mtn City · Structure no. 460A2490001

Built
1975
50 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
80
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A249 over Stone Branch is a concrete continuous culvert carrying Nfa A249 over Stone Branch in Johnson County, Tennessee. It was built in 1975, so it is 50 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.

It carries about 80 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2042. The structure is 27 ft (8.1 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNfa A249
CrossesStone Branch
LocationN Off US421-N of Mtn City
RouteCounty Highway 249
CountyJohnson County
StateTennessee
Coordinates36.4972, -81.81693
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span12 ft (3.7 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic128 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 A249 over Stone Branch built?

It was built in 1975, making it 50 years old in 2025.

What condition is Nfa A249 over Stone Branch 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 A249 over Stone Branch carry?

About 80 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Nfa A249 over Stone Branch?

The structure is 27 ft (8.1 m) long with a longest span of 12 ft (3.7 m) and a deck 30 ft wide.

Who owns Nfa A249 over Stone Branch?

It is owned by the County Highway Agency.