HELENA, Mont. (AP) – Weekend avalanches killed six people in Montana, Utah and Idaho, with one bruised survivor traveling miles by snowmobile and on foot to reach help, authorities said.

In Montana’s Big Belt Mountains, the bodies of two snowmobilers caught in an avalanche were found by searchers early Sunday and removed by helicopter later in the day.

That avalanche happened Saturday at the base of Mount Baldy, about 20 miles from Townsend. A survivor traveled the 15 or 20 miles back to the trailhead, initially by snowmobile and then on foot after the machine became stuck, Lewis and Clark County Sheriff Cheryl Leidle said.

Upon reaching a pickup truck at the trailhead, he used a cell phone to call for help.

“It would appear the avalanche drove them into a grove of trees downhill from the avalanche itself,” Leidle said.

The Sunday death of a 17-year-old Massachusetts skier brought Utah’s weekend avalanche death toll to three.

The Massachusetts boy, was skiing out of bounds near Snowbasin ski resort when he was caught in the 2 p.m. slide, the Weber County sheriff’s office said. Authorities believe the boy triggered the slide, which was about 10-to-20 feet deep and 500 feet wide.

Authorities found the boy’s body after several hours of searching. An autopsy will be conducted to determine an exact cause of death. The boy’s name has not yet been released. Police said he had traveled here with his father and brother, who were skiing inside resort boundaries at the time of the slide.

On Saturday, Sixteen-year-old Zachary Holmes of Farr West, died in a slide near Tower Mountain in the Uinta Mountains, about 14 miles southeast of Heber City.

Also Saturday, a 44-year-old Richfield snowmobiler died in a slide near Signal Peak in southwestern Utah’s Sevier County and Nicholas Guss Steinmann, 26, of Ogden was killed while snowmobiling in Bonneville County, Idaho.