US Bridges

I40 Rt LN over Clinch River & Nfa A774

Fair

Roane County, Tennessee · 2.1 M SE JCT I40&SR29 · Structure no. 73I00400013

Built
1960
65 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,422 ft
3 main spans
Daily traffic
49,070
2021 count
Owner
State
State Highway Agency

About this bridge

I40 Rt LN over Clinch River & Nfa A774 is a steel continuous stringer/multi-beam or girder carrying I40 Rt LN over Clinch River & Nfa A774 in Roane County, Tennessee. It was built in 1960, so it is 65 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 49,070 vehicles a day, roughly 6% of them trucks, projected to reach 78,512 by 2042. The structure is 1,422 ft (433.4 m) long and 71 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI40 Rt LN
CrossesClinch River & Nfa A774
Location2.1 M SE JCT I40&SR29
RouteInterstate 40
CountyRoane County
StateTennessee
Coordinates35.89035, -84.52657
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+10 approach)
Design loadHS 20
Structure length1,422 ft (433.4 m)
Longest span292 ft (89 m)
Deck width71 ft (21.7 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,070 (2021)
Projected traffic78,512 by 2042
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed5 mi (8 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.9 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I40 Rt LN over Clinch River & Nfa A774 built?

It was built in 1960, making it 65 years old in 2025.

What condition is I40 Rt LN over Clinch River & Nfa A774 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 October 2024.

How much traffic does I40 Rt LN over Clinch River & Nfa A774 carry?

About 49,070 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I40 Rt LN over Clinch River & Nfa A774?

The structure is 1,422 ft (433.4 m) long with a longest span of 292 ft (89 m) and a deck 71 ft wide.

Who owns I40 Rt LN over Clinch River & Nfa A774?

It is owned by the State Highway Agency.