US Bridges

Nfa A612 over Lathan Springs Branch

Fair

McMinn County, Tennessee · .5MI West of I75 · Structure no. 540A6120001

Built
1968
57 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
490
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A612 over Lathan Springs Branch is a concrete continuous culvert carrying Nfa A612 over Lathan Springs Branch in McMinn County, Tennessee. It was built in 1968, so it is 57 years old, older 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 490 vehicles a day, roughly 2% of them trucks, projected to reach 784 by 2042. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNfa A612
CrossesLathan Springs Branch
Location.5MI West of I75
RouteCounty Highway 612
CountyMcMinn County
StateTennessee
Coordinates35.51164, -84.60436
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic490 (2020)
Projected traffic784 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 A612 over Lathan Springs Branch built?

It was built in 1968, making it 57 years old in 2025.

What condition is Nfa A612 over Lathan Springs 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 September 2023.

How much traffic does Nfa A612 over Lathan Springs Branch carry?

About 490 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A612 over Lathan Springs Branch?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.7 m).

Who owns Nfa A612 over Lathan Springs Branch?

It is owned by the County Highway Agency.