I've posted the link below for this specific question on an FAQ to the Official US website.
http://help.customs.gov/cgi-bin/cust...i=&p_topview=1
The summary is that you need proof of citizenship to reenter the US. That can be either a passport or birth certificate, (I think there are some other acceptable docs listed as well) if you are travelling by car. It must be a passport if you are travelling by plane.
You won't have trouble crossing into Canada. It'll be coming back that might be an issue. The website listed above is a great resource for these kinds of questions related to travel.



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