US Bridges

FAS 9 over Lyon Creek

Fair

Knox County, Tennessee · In Trentville · Structure no. 47SR0090011

Built
1933
92 years old, rebuilt 1967
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
4,971
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 9 over Lyon Creek is a concrete continuous culvert carrying FAS 9 over Lyon Creek in Knox County, Tennessee. It was built in 1933 and reconstructed in 1967, so it is 92 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 4,971 vehicles a day, roughly 5% of them trucks, projected to reach 7,698 by 2041. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesFAS 9
CrossesLyon Creek
LocationIn Trentville
RouteU.S. Route 25
CountyKnox County
StateTennessee
Coordinates36.02521, -83.72655
Functional classUrban 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
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,971 (2021)
Projected traffic7,698 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$361,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS 9 over Lyon Creek built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1967.

What condition is FAS 9 over Lyon 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 September 2023.

How much traffic does FAS 9 over Lyon Creek carry?

About 4,971 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAS 9 over Lyon Creek?

The structure is 26 ft (7.9 m) long with a longest span of 11 ft (3.5 m).

Who owns FAS 9 over Lyon Creek?

It is owned by the State Highway Agency.