Home2000 Treaties and Agreements ...Canada (00-1205) – Agreements Extending the Agreement of October 28 and December 5, 1980, as Extended, for the Coordination of Icebreaking Activities of Canada and the US of America on the Great Lakes-St. Lawrence Seaway System hide Canada (00-1205) – Agreements Extending the Agreement of October 28 and December 5, 1980, as Extended, for the Coordination of Icebreaking Activities of Canada and the US of America on the Great Lakes-St. Lawrence Seaway System TIAS Office of Treaty Affairs December 5, 2000 Boundaries and Boundary Waters: Icebreaking Agreements effected by exchange of notes at Washington December 4 and 5, 2000; entered into force December 5, 2000. Effected by exchange of notes at Washington December 5, 2005; entered into force December 5, 2005. Effected by exchange of notes at Washington November 30 and December 2, 2010; entered into force December 2, 2010. Download Attachment [529 KB] Tags Boundaries and Boundary Waters Canada International Law, Treaties, and Agreements