From
http://www.pptc.gc.ca/menu_e.asp
Do I now need a passport to travel to the United States?
Though passports are the document of choice for travel, Canadian citizens do not currently require a passport to travel to the United States. However, Passport Canada encourages Canadians who are considering travelling outside Canada to obtain a passport, as it is the most widely accepted proof of Canadian identity and citizenship.
Passports - urgent applications
Note: Urgent or express services are available for emergency or compassionate reasons on a case-by-case basis. These services are available only for those applicants who can apply in person at a Passport Canada office and who provide proof to justify the urgency.
Service Turnaround Fee
Urgent next working day $70 + passport fee
Express 2 to 9 working days after receiving application $30 + passport fee