Snowmobilers wishing to spend some time this weekend in the Island Park area of Idaho should be advised that snow conditions there are not optimal. According to the Caribou-Targhee National Forest, light snow conditions have still allowed passenger vehicle traffic on National Forest Roads typically open to summer motorized travel. Vehicle travel will be allowed until snow depth prevents cars and trucks from using the roadways or Fremont County begins snowmobile trail grooming. Meanwhile, the winter travel regulations for the Ashton/Island Park Ranger District of Caribou-Targhee National Forest took effect yesterday, governing winter travel opportunities for both winter cross-country use and winter designated routes. Most of the Ashton/Island Park Ranger District is open to winter cross-country motorized use. However, forest officials point out that the area known as Big Bend Ridge is closed to winter cross-country use until January 1st for the security of the elk and deer migrating to their winter range west of the Forest.