The Athol, Idaho resident competed in the Women's 10-metre Air Rifle at the 2004 Summer Olympics in Athens, Greece.
In 2003 Pan American Games, she won a bronze medal in the Women's 50-meter Rifle 3 Positions Event.
At the 2004 Summer Olympics, Johnson competed while a member of the United States Army.
She was then a medical Spc., assigned to the Marksmanship Unit at Fort Benning, Georgia.