US Bridges

Nfa A318 over Salt Lick Creek

Good

Macon County, Tennessee · 2 M N Red Boiling Springs · Structure no. 560A3180001

Built
2001
24 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
40
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A318 over Salt Lick Creek is a prestressed concrete box beam or girders - single or spread carrying Nfa A318 over Salt Lick Creek in Macon County, Tennessee. It was built in 2001, so it is 24 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 40 vehicles a day, roughly 1% of them trucks, projected to reach 64 by 2041. The structure is 76 ft (23.2 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNfa A318
CrossesSalt Lick Creek
Location2 M N Red Boiling Springs
RouteCounty Highway 318
Coordinates36.55315, -85.86275
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span76 ft (23.2 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic64 by 2041
Trucks1%
Lanes on structure2
Traffic directionOne-lane bridge for two-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 A318 over Salt Lick Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is Nfa A318 over Salt Lick Creek 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 September 2023.

How much traffic does Nfa A318 over Salt Lick Creek carry?

About 40 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A318 over Salt Lick Creek?

The structure is 76 ft (23.2 m) long with a longest span of 76 ft (23.2 m) and a deck 24 ft wide.

Who owns Nfa A318 over Salt Lick Creek?

It is owned by the County Highway Agency.