Yellowstone to begin plowing roads in early March-

The pollution of Yellowstone's snowmobile season will fade in early March. The road from Mammoth to Norris Jct. will close to the machines on March 6. Norris Jct. to Madison Jct. and Canyon will close on March 8. Winter visitor facilities at Mammoth close March 5 and Old Faithful on March 12.

Cooke City to Colter Pass east of the Park will be open to snowmobiles until May 1.

Recent figures show it costs much more per visitor to service wintertime visitors than those who come in the summer.