Passports required to enter the U.S. by Boat

Starting Monday, June 1, 2009, everyone will need a passport to enter the U.S. by land or boat. Also accepted: NEXUS card, FAST Free and Secure Trade card, or enhanced drivers licence (in provinces where available). (Canada has not changed any requirements to enter Canada from the States.) [Homeland Security | U.S. Customs & Border Protection (CBP)]

Passports to enter the U.S.A. by Boat this Summer

In June 2009, everyone will need a passport* to enter the U.S. by land or boat. If you are getting one for the first time, apply well before June. (Currently, Canadians flying into the U.S. must have a passport, but you may enter by car or boat with a birth certificate plus a government-issued photo ID.)
The new United States Homeland Security Secretary Janet Napolitano is calling for a review of the U.S.-Canada border situation, pressured by some members of U.S. Congress and Homeland Security experts who are requesting greater security at the border. (Canada has not changed any requirements to enter Canada from the States.) U.S. Customs & Border Protection (CBP)
*Also accepted in addition to a passport: NEXUS card, FAST Free and Secure Trade card, or enhanced drivers licence (in provinces where available).

New rules to Enter the U.S. by boat

Beginning January 31, 2008, all U.S. and Canadian citizens must have more identification to enter the U.S.A. by boat, ferry, train, or bus. Under a new U.S. law, all travelers over 19 years of age must have a proof of citizenship (birth certificate, naturalization certificate) and government-issued photo ID (drivers license) at U.S. land and sea border stations. Passports are valid for both requirements. Children 18 and under will need just a birth certificate for now. (Passports are currently required to enter the U.S. by air, and will be required for all travel to the U.S. by June 2009) [U.S. Customs and Border Protection (CBP)]