US Bridges

FAS 145 over Mcknight Branch

Fair

Cannon County, Tennessee · 2 Mi.S.Of Auburntown · Structure no. 08SR1450009

Built
1952
73 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
945
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 145 over Mcknight Branch is a concrete culvert carrying FAS 145 over Mcknight Branch in Cannon County, Tennessee. It was built in 1952, so it is 73 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 945 vehicles a day, roughly 5% of them trucks, projected to reach 1,456 by 2041. The structure is 22 ft (6.6 m) long and 27 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesFAS 145
CrossesMcknight Branch
Location2 Mi.S.Of Auburntown
RouteState Highway 145
CountyCannon County
StateTennessee
Coordinates35.91535, -86.10325
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length22 ft (6.6 m)
Longest span22 ft (6.6 m)
Deck width27 ft (8.1 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic945 (2021)
Projected traffic1,456 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$79,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS 145 over Mcknight Branch built?

It was built in 1952, making it 73 years old in 2025.

What condition is FAS 145 over Mcknight 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 January 2025.

How much traffic does FAS 145 over Mcknight Branch carry?

About 945 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAS 145 over Mcknight Branch?

The structure is 22 ft (6.6 m) long with a longest span of 22 ft (6.6 m) and a deck 27 ft wide.

Who owns FAS 145 over Mcknight Branch?

It is owned by the State Highway Agency.