US Bridges

FAS 309 over I75

Fair

McMinn County, Tennessee · 21.15 MI from Bradley CO · Structure no. 54I00750039

Built
1972
53 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
529 ft
4 main spans
Daily traffic
1,738
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 309 over I75 is a steel continuous stringer/multi-beam or girder carrying FAS 309 over I75 in McMinn County, Tennessee. It was built in 1972, so it is 53 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 1,738 vehicles a day, roughly 3% of them trucks, projected to reach 2,781 by 2042. The structure is 529 ft (161.3 m) long and 46 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFAS 309
CrossesI75
Location21.15 MI from Bradley CO
RouteState Highway 309
Coordinates35.54817, -84.56586
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length529 ft (161.3 m)
Longest span137 ft (41.8 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,738 (2021)
Projected traffic2,781 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAS 309 over I75 built?

It was built in 1972, making it 53 years old in 2025.

What condition is FAS 309 over I75 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 April 2024.

How much traffic does FAS 309 over I75 carry?

About 1,738 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is FAS 309 over I75?

The structure is 529 ft (161.3 m) long with a longest span of 137 ft (41.8 m) and a deck 46 ft wide.

Who owns FAS 309 over I75?

It is owned by the State Highway Agency.