Do you need a visa to travel across Canada to Alaska?

At least your US passport.

Entry Information:

U.S. and Canadian residents must carry photo ID (driver's license) and proof of citizenship (passport, birth certificate) for travel through Canada and Alaska.

For additional information visit
http://511.alaska.gov
http://www.ccra-adrc.gc.ca
http://www.customs.ustreas.gov

Identification is required for all minors traveling in your party.

Persons under 18 not accompanied by parents should carry a letter from their legal guardian granting permission to travel to Canada.

Be prepared to show proof of insurance and vehicle registration or rental papers.

You can transport your dog or cat through Canada as long as you have proof of current rabies vaccination.

You cannot enter Canada from the U.S. if you have a criminal record