US Bridges

I-65 over 21st Street

Good

Marion County, Indiana · 04.16 N I-70 · Structure no. 036720

Built
1968
57 years old, rebuilt 2005
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
171 ft
3 main spans
Daily traffic
124,369
2019 count
Owner
State
State Highway Agency

About this bridge

I-65 over 21st Street is a steel continuous stringer/multi-beam or girder carrying I-65 over 21st Street in Marion County, Indiana. It was built in 1968 and reconstructed in 2005, so it is 57 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 124,369 vehicles a day, roughly 5% of them trucks, projected to reach 138,100 by 2042. The structure is 171 ft (52.2 m) long and 133 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-65
Crosses21st Street
Location04.16 N I-70
RouteInterstate 65
CountyMarion County
StateIndiana
Coordinates39.79498, -86.1647
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 rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length171 ft (52.2 m)
Longest span89 ft (27.2 m)
Deck width133 ft (40.5 m)
Roadway width127 ft (38.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic124,369 (2019)
Projected traffic138,100 by 2042
Trucks5%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 over 21st Street built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2005.

What condition is I-65 over 21st Street 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 over 21st Street carry?

About 124,369 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is I-65 over 21st Street?

The structure is 171 ft (52.2 m) long with a longest span of 89 ft (27.2 m) and a deck 133 ft wide.

Who owns I-65 over 21st Street?

It is owned by the State Highway Agency.