US Bridges

Nfa A497 over Mayo Branch

Fair

Gibson County, Tennessee · 3.3 MI NW JCT SR43&SR77 · Structure no. 270A4970005

Built
1987
38 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
38 ft
3 main spans
Daily traffic
100
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A497 over Mayo Branch is a concrete continuous culvert carrying Nfa A497 over Mayo Branch in Gibson County, Tennessee. It was built in 1987, so it is 38 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 100 vehicles a day, roughly 2% of them trucks, projected to reach 160 by 2042. The structure is 38 ft (11.6 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A497
CrossesMayo Branch
Location3.3 MI NW JCT SR43&SR77
RouteCounty Highway 497
CountyGibson County
StateTennessee
Coordinates35.95803, -88.79669
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span12 ft (3.7 m)
Deck width28 ft (8.5 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic160 by 2042
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A497 over Mayo Branch built?

It was built in 1987, making it 38 years old in 2025.

What condition is Nfa A497 over Mayo Branch 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 July 2023.

How much traffic does Nfa A497 over Mayo Branch carry?

About 100 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A497 over Mayo Branch?

The structure is 38 ft (11.6 m) long with a longest span of 12 ft (3.7 m) and a deck 28 ft wide.

Who owns Nfa A497 over Mayo Branch?

It is owned by the County Highway Agency.