An interagency management team said the Bertschi Road Fire south of Glenwood is now 85% contained.   A significant demobilization of resources assigned to the fire is planned for Thursday, with transfer of command to a Type 4 management team set for Friday afternoon.  Officials say mop up and gridding of the 250-acre fire is going well.  The fire burned in heavy logging slash, timber, and short grass.  It started a week ago, and the cause remains under investigation.