US Bridges

I-65 NB over Southern Avenue

Good

Marion County, Indiana · 01.70 S I-70 · Structure no. 036170

Built
1973
52 years old, rebuilt 1997
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
133 ft
3 main spans
Daily traffic
46,327
2004 count
Owner
State
State Highway Agency

About this bridge

I-65 NB over Southern Avenue is a steel continuous stringer/multi-beam or girder carrying I-65 NB over Southern Avenue in Marion County, Indiana. It was built in 1973 and reconstructed in 1997, so it is 52 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 46,327 vehicles a day, roughly 5% of them trucks, projected to reach 92,284 by 2030. The structure is 133 ft (40.5 m) long and 67 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-65 NB
CrossesSouthern Avenue
Location01.70 S I-70
RouteInterstate 65
CountyMarion County
StateIndiana
Coordinates39.73034, -86.13613
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length133 ft (40.5 m)
Longest span62 ft (18.9 m)
Deck width67 ft (20.5 m)
Roadway width65 ft (19.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46,327 (2004)
Projected traffic92,284 by 2030
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-65 NB over Southern Avenue built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1997.

What condition is I-65 NB over Southern Avenue in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does I-65 NB over Southern Avenue carry?

About 46,327 vehicles per day (2004 count), of which roughly 5% are trucks.

How long is I-65 NB over Southern Avenue?

The structure is 133 ft (40.5 m) long with a longest span of 62 ft (18.9 m) and a deck 67 ft wide.

Who owns I-65 NB over Southern Avenue?

It is owned by the State Highway Agency.