All national forests that have significant over-snow recreation are going to be reviewing their winter travel management policies in the near future (that's in bureaucratic time frame..wheeled travel management started about ten years ago and still is not completed). Most national forests will be adopting new winter travel management plans. These plans will determine where motorized recreation is allowed and where it is not, and may also set policies for winter recreation access. This is the time for skiers and snowboarders to speak up and let the forest service know that backcountry winter recreation is very important, including access to lands where one can ski without the noise and other impacts of motorized recreation. The process has already started in five national forests in California.
More information with regard to the winter travel management process in the national forests in California is here: http://snowlands.org/wtm/index.html
Information with regard to other national forests is here: http://winterwildlands.org/what-we-do/policy-advocacy/
These are your public lands.