US Bridges

I75 over Knob Fork Cr.

Fair

Knox County, Tennessee · .3 M SE of Beaver CR DR · Structure no. 47I00750043

Built
1969
56 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
81,818
2021 count
Owner
State
State Highway Agency

About this bridge

I75 over Knob Fork Cr. is a concrete continuous culvert carrying I75 over Knob Fork Cr. in Knox County, Tennessee. It was built in 1969, so it is 56 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 81,818 vehicles a day, roughly 6% of them trucks, projected to reach 108,160 by 2041. The structure is 26 ft (8 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesI75
CrossesKnob Fork Cr.
Location.3 M SE of Beaver CR DR
RouteInterstate 75
CountyKnox County
StateTennessee
Coordinates36.03339, -83.99834
Functional classUrban Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 (8 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 traffic81,818 (2021)
Projected traffic108,160 by 2041
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$416,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I75 over Knob Fork Cr. built?

It was built in 1969, making it 56 years old in 2025.

What condition is I75 over Knob Fork Cr. 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 November 2024.

How much traffic does I75 over Knob Fork Cr. carry?

About 81,818 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I75 over Knob Fork Cr.?

The structure is 26 ft (8 m) long with a longest span of 11 ft (3.5 m).

Who owns I75 over Knob Fork Cr.?

It is owned by the State Highway Agency.