1. Short title This Act may be cited as the Great Lakes Winter Commerce Act of 2020 . 2. Great Lakes icebreaking operations (a) In general Subchapter IV of chapter 5 of title 14, United States Code, is amended by adding at the end the following: 564. Great Lakes icebreaking operations (a) Icebreaking operations The Commandant shall conduct icebreaking operations in the Great Lakes in accordance with the standard for icebreaking operations under subsection (b). (b) Standard for icebreaking operations In carrying out subsection (a)— (1) except as provided in paragraph (2), the Commandant shall keep channels and harbors in the Great Lakes open to navigation not less than 90 percent of the hours that commercial vessels transit ice-covered waterways