US Bridges

I81 731310M over Southern Railway

Fair

Greene County, Tennessee · 3.85MI from Hamblen CO LN · Structure no. 30I00810011

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
175 ft
3 main spans
Daily traffic
44,318
2021 count
Owner
State
State Highway Agency

About this bridge

I81 731310M over Southern Railway is a prestressed concrete continuous stringer/multi-beam or girder carrying I81 731310M over Southern Railway in Greene County, Tennessee. It was built in 1970, so it is 55 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 44,318 vehicles a day, roughly 6% of them trucks, projected to reach 70,909 by 2042. The structure is 175 ft (53.3 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI81 731310M
CrossesSouthern Railway
Location3.85MI from Hamblen CO LN
RouteInterstate 81
CountyGreene County
StateTennessee
Coordinates36.21455, -83.0665
Functional classRural 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.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating13.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span59 ft (17.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,318 (2021)
Projected traffic70,909 by 2042
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I81 731310M over Southern Railway built?

It was built in 1970, making it 55 years old in 2025.

What condition is I81 731310M 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 July 2024.

How much traffic does I81 731310M over Southern Railway carry?

About 44,318 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I81 731310M over Southern Railway?

The structure is 175 ft (53.3 m) long with a longest span of 59 ft (17.9 m) and a deck 42 ft wide.

Who owns I81 731310M over Southern Railway?

It is owned by the State Highway Agency.