US Bridges

Nfa A318 over Rocky Branch

Good

Wilson County, Tennessee · 0.01 MI West of SR267 · Structure no. 950A3180001

Built
1995
30 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
64 ft
3 main spans
Daily traffic
150
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A318 over Rocky Branch is a concrete continuous culvert carrying Nfa A318 over Rocky Branch in Wilson 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 150 vehicles a day, roughly 2% of them trucks, projected to reach 240 by 2040. The structure is 64 ft (19.5 m) long and 33 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesNfa A318
CrossesRocky Branch
Location0.01 MI West of SR267
RouteCounty Highway 0A318
Coordinates36.0261, -86.1269
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2020)
Projected traffic240 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A318 over Rocky Branch built?

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

What condition is Nfa A318 over Rocky 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 June 2024.

How much traffic does Nfa A318 over Rocky Branch carry?

About 150 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A318 over Rocky Branch?

The structure is 64 ft (19.5 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns Nfa A318 over Rocky Branch?

It is owned by the County Highway Agency.