The Canada-United States Transfer Border Working Group offers a map of the Canada-United States border on its website, TheTBWG.org. This interactive map allows users to view the border from both the national and state levels, and it provides information on specific border crossing names, approach roads and hours of operation.
EZBorderCrossing.com also provides detailed information about border crossings in every U.S. state that borders Canada, except Alaska. From The Border Crossings page, clicking on an individual state loads a Google map of that state's border, along with links to further information about every border crossing point within that state.
EZBorderCrossing.com also provides resources on required immigration documents, the customs inspection process, approach road conditions and speed limits in both countries.