Interstate 465

Interstate 465
USS Indianapolis Memorial Highway
Former routes of U.S. and State highways that are now defunct or routed on I-465 are shown in gray.
Route information
Maintained by INDOT
Length:	52.79 mi (84.96 km)
Existed:	1959 (completed 1970) – present
Major junctions
Beltway around Indianapolis, Indiana
	I-65 (South Side) I-70 (Southwest Side) I-74 (West Side) I-65 (Northwest side) I-865 (Northwest Side) I-69 (Northeast side) I-70 (East side) I-74 (Southeast side)
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Indiana Highways Interstate US State Former Scenic ← SR 462 I-469 →

Interstate 465 (I-465), also known as the USS Indianapolis Memorial Highway, is the beltway circling Indianapolis, Indiana, United States. It is roughly rectangular in shape and has a perimeter of approximately 53 miles (85 km). It lies almost completely within the boundaries of Marion County, except for two short sections on the north leg in Boone and Hamilton Counties. It crosses I-65, I-69, I-70 and I-74, and provides additional access to I-65 via I-865.

Except for I-65 and I-70, no numbered highways run through downtown Indianapolis. All highways that continue from one side to the other are routed around the city, concurrent with I-465:

The approximately one-mile section between exits 46 and 47 upon completion of the Interstate 69 extension will carry nine routes — I-465, I-69, US 31, US 36, US 40, US 52, US 421, SR 37 and SR 67. In most cases, markers other than I-74's are not posted along I-465 itself; rather, signs on the entrance ramps direct traffic traveling a particular route to follow I-465 to a specific exit to continue on that route.

A beltway for Indianapolis was part of the original plan of the Interstate System in 1955. The general alignment was to be either on or adjacent to the now-defunct SR 100, which by then had only two completed legs—on the north side, along 86th Street to the west of the White River and 82nd Street east of the river, and on the east side along Shadeland Avenue. On the city's west side, an alignment corridor paralleling High School Road was preferred, and on the south side, one between Hanna Avenue and Thompson Road was proposed. Development along 86th Street made its use unfeasible for I-465, so a 91st Street alignment was initially proposed. This proved to be controversial, and caused many delays in final alignment selection for the North Leg, postponing its construction by several years.