Nfa B399 over Branch

Good

Madison County, Tennessee · N of Jackson · Structure no. 570B3990001

Built: 1970; 55 years old
Condition: Good; inspected May 2023
Type: Culvert; Concrete Continuous
Length: 26 ft; 2 main spans
Daily traffic: 2,290; 2020 count
Owner: County; County Highway Agency

About this bridge

Nfa B399 over Branch is a concrete continuous culvert carrying Nfa B399 over Branch in Madison County, Tennessee. It was built in 1970, so it is 55 years old, older 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 2,290 vehicles a day, roughly 10% of them trucks, projected to reach 3,664 by 2041. The structure is 26 ft (7.9 m) long and 49 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps

CarriesNfa B399

CrossesBranch

LocationN of Jackson

RouteCounty Highway 399

CountyMadison County

StateTennessee

Coordinates35.72458, -88.83531

Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	7 Good	Some minor problems.

Last inspectionMay 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating67.9 US tons

Inventory rating35.7 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length26 ft (7.9 m)

Longest span12 ft (3.7 m)

Deck width49 ft (14.9 m)

Roadway width34 ft (10.4 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,290 (2020)

Projected traffic3,664 by 2041

Trucks10%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed9.9 mi (16 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 B399 over Branch built?

It was built in 1970, making it 55 years old in 2025.

What condition is Nfa B399 over Branch 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 May 2023.

How much traffic does Nfa B399 over Branch carry?

About 2,290 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nfa B399 over Branch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 49 ft wide.

Who owns Nfa B399 over Branch?

It is owned by the County Highway Agency.