US Bridges

Nfa A108 over Snake Creek

Fair

McNairy County, Tennessee · 12 MI W of SR22 · Structure no. 550A1080001

Built
1998
27 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
67 ft
3 main spans
Daily traffic
50
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A108 over Snake Creek is a concrete continuous culvert carrying Nfa A108 over Snake Creek in McNairy County, Tennessee. It was built in 1998, so it is 27 years old, younger 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 80 by 2040. The structure is 67 ft (20.5 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A108
CrossesSnake Creek
Location12 MI W of SR22
RouteCounty Highway 108
CountyMcNairy County
StateTennessee
Coordinates35.28675, -88.47725
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length67 ft (20.5 m)
Longest span18 ft (5.5 m)
Deck width28 ft (8.5 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2020)
Projected traffic80 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 A108 over Snake Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is Nfa A108 over Snake Creek 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 August 2024.

How much traffic does Nfa A108 over Snake Creek carry?

About 50 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A108 over Snake Creek?

The structure is 67 ft (20.5 m) long with a longest span of 18 ft (5.5 m) and a deck 28 ft wide.

Who owns Nfa A108 over Snake Creek?

It is owned by the County Highway Agency.