1.

Kay Ceske

54.21

1985

2.

Mariana Muñoz-Morris

54.41

2001

3.

Emily Nathon

54.82

2006

4.

Eliza Callwood

54.83

2006

5.

Katie Williams

54.93

2003

6.

Joelle Inamine

55.12

2000

7.

Sara Ajifu

55.33

2005

8.

Kelly Conway

55.68

1994

8.

Tami Dale

55.68

1997

10.

Sarah Wald-Hopkins

56.75

1993