US Bridges

I81 730393A over Southern Railway

Fair

Hamblen County, Tennessee · .2/M.FROM Jefferson Co.Ln · Structure no. 32I00810001

Built
1967
58 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
49,004
2021 count
Owner
State
State Highway Agency

About this bridge

I81 730393A over Southern Railway is a prestressed concrete continuous stringer/multi-beam or girder carrying I81 730393A over Southern Railway in Hamblen County, Tennessee. It was built in 1967, so it is 58 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 5 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 49,004 vehicles a day, roughly 6% of them trucks, projected to reach 57,600 by 2040. The structure is 122 ft (37.1 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI81 730393A
CrossesSouthern Railway
Location.2/M.FROM Jefferson Co.Ln
RouteInterstate 81
CountyHamblen County
StateTennessee
Coordinates36.13618, -83.2829
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length122 ft (37.1 m)
Longest span41 ft (12.4 m)
Deck width40 ft (12.3 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,004 (2021)
Projected traffic57,600 by 2040
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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$1.2 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I81 730393A over Southern Railway built?

It was built in 1967, making it 58 years old in 2025.

What condition is I81 730393A over Southern Railway 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 February 2024.

How much traffic does I81 730393A over Southern Railway carry?

About 49,004 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I81 730393A over Southern Railway?

The structure is 122 ft (37.1 m) long with a longest span of 41 ft (12.4 m) and a deck 40 ft wide.

Who owns I81 730393A over Southern Railway?

It is owned by the State Highway Agency.