IRP was opened in 1961.

Sportsdrome Speedway

The 3 remaining tracks were all paved and two still exist today.

Correct. 2 to go.

Raceway Park in Chesterfield?

No.

Allen County Coliseum

My question was meant to include outdoor ovals only. But, since I didn't say that, you are correct. We still need two more.

Illiana Motor Speedway

I'll give one hint for each track. One is a half mile paved track that still exists. The other was a 1/5 mile paved track that closed forever at the end of the 1957 season (9/27/57).