Monday, ODOT was warning Portland drivers not to travel the passes because the weather was so bad. Today, the snow has stopped and the passes are passable, but: “You definitely have to be prepared for the travel conditions. Santiam Pass is snow packed. The temperatures are just above freezing, so it's better to go over during the day with traction tires on your wheels. Dave Thompson with ODOT says traction tires or chains are required to travel the passes currently.