US Bridges

Nfa A318 over Harper Branch

Good

Lincoln County, Tennessee · 6 M. S. Fayetteville. · Structure no. 520A3180003

Built
1940
85 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
1,750
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A318 over Harper Branch is a concrete continuous culvert carrying Nfa A318 over Harper Branch in Lincoln County, Tennessee. It was built in 1940, so it is 85 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 1,750 vehicles a day, roughly 2% of them trucks, projected to reach 2,800 by 2042. The structure is 21 ft (6.3 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A318
CrossesHarper Branch
Location6 M. S. Fayetteville.
RouteCounty Highway 318
CountyLincoln County
StateTennessee
Coordinates35.06435, -86.58822
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.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2020)
Projected traffic2,800 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$113,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A318 over Harper Branch built?

It was built in 1940, making it 85 years old in 2025.

What condition is Nfa A318 over Harper 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 August 2023.

How much traffic does Nfa A318 over Harper Branch carry?

About 1,750 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A318 over Harper Branch?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns Nfa A318 over Harper Branch?

It is owned by the County Highway Agency.