US Bridges

I40 over SR 73

Fair

Loudon County, Tennessee · .6 M W of Roane CO LN · Structure no. 53I00400005

Built
1960
65 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
156 ft
3 main spans
Daily traffic
42,725
2021 count
Owner
State
State Highway Agency

About this bridge

I40 over SR 73 is a steel stringer/multi-beam or girder carrying I40 over SR 73 in Loudon 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 42,725 vehicles a day, roughly 6% of them trucks, projected to reach 68,360 by 2042. The structure is 156 ft (47.7 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesI40
CrossesSR 73
Location.6 M W of Roane CO LN
RouteInterstate 40
CountyLoudon County
StateTennessee
Coordinates35.87477, -84.32455
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length156 ft (47.7 m)
Longest span72 ft (21.8 m)
Deck width36 ft (11.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,725 (2021)
Projected traffic68,360 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 over SR 73 built?

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

What condition is I40 over SR 73 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 over SR 73 carry?

About 42,725 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I40 over SR 73?

The structure is 156 ft (47.7 m) long with a longest span of 72 ft (21.8 m) and a deck 36 ft wide.

Who owns I40 over SR 73?

It is owned by the State Highway Agency.