You may or may not need a passport to get into Canada, at the discretion of the border official, but you will definitely need some proof of US citizenship (e.g. birth certificate).
The bigger problem will be getting back into the US. My brother-in-law and his family are American-born Americans that live near the Canadian border. They came across to Canada recently without their passports, but they had a major problem trying to get back into the US without them (>3 hrs detained at the border while the US border officials tried to verify their identity and citizenship).
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