Male guards have been replaced by women in the living units at two of Michigan's three corrections facilities for women.
The change has been made at facilities in Plymouth and Ypsilanti. It comes in response to allegations that male corrections officers abused female inmates.
More than 1500 women are held at the two sites.
Also, all but three male officers have been replaced at a boot camp near Pinckney that houses about 400 women. Officials say the remaining men will soon be replaced.
The state agreed to make the changes in 1999 after being sued following a US Justice Department investigation into sexual abuse complaints.
Guards had sued to stop the staffing changes, but the US Supreme Court declined to hear their case in October.