More search and rescue teams Tuesday for missing father and son from Minnesota near Mount Evans

Last cellphone signal was Wednesday evening

CLEAR CREEK COUNTY, Colo. - More search and rescue groups will be used Tuesday to look for a missing father and son from Minnesota near Mount Evans.

The search will resume at the Echo Lake Campgrounds area off Colorado Highway 103 outside of Idaho Springs Tuesday morning. The search will include 50 Search And Rescue members from the following teams:  Alpine Rescue Team, Arapahoe Rescue Patrol, Diamonds Peaks Ski Patrol, Douglas County SAR, Larimer County SAR, Rocky Mountain Rescue Group, Summit County SAR and Vail Mountain Rescue.

Deputies from the Clear Creek County Sheriff's Office and members of an Alpine Rescue Team continued to search in the Arapahoe National Forest south of Echo Lake on Monday, despite brutal weather conditions: blowing snow and wind chill temps in the single digits..

Damian McManus, 51, and Evan McManus, 18, from St. Louis Park, Minn., were last heard from on Wednesday, said Bill Barwick with the Alpine Rescue Team.

Their snow-covered car, a maroon Ford Edge, was found in the Echo Lake parking lot Sunday and was still there Monday evening..

Searchers found a receipt in the Ford showing the pair had breakfast at at Denny's in Lakewood on Wednesday morning. 

"Wednesday evening is the last signal they had from their cellphone," family friend Andrea Bouzrara told 7NEWS by phone  

"The weather was, once again an issue with winds whipping over 25 mph, and on-and-off snow squalls throughout the day.  Searchers were subjected to below-zero wind chill conditions at a starting elevation of 10,600 feet," said a Monday night statement from the Clear Creek Sheriff's Office.

It has snowed in the Echo Lake area from Wednesday through Saturday and the two could have faced 2 to 3 feet of snow, searchers said.

Steve Wilson, with the Alpine Rescue Team, says the military helicopters were requested to help with the search after a different helicopter was used as a spotter on Sunday. 

"Hopefully they've used some ingenuity to stay alive," Wilson said. 

Snowmobiles, ATVs and a helicopter were involved in the search on Sunday.

Alpine Rescue spokesman Bill Barwick said the Alpine team was challenged in knowing where to search, because they only have vague details on where the pair planned to go. 

"We have no idea of what kind of gear they might have," Barwick said.

Evan McManus had told his girlfriend, "We're going to scale a peak." But, he didn't say what peak, Barwick said. 

The father and son were due back from a camping trip on Sunday. They had driven to Colorado from Minnesota and planned to stop and hike along the way as part of their father-son trip for spring break, family friends say.

"Damien and Evan decided to take a boys trip," Bouzrara said. "Just take an impromptu boys trip and take a car ride out west and do some hiking and stopped a few places along the way."

The two men were reported missing by Damian McManus' wife and Evan's twin sister, who returned home Sunday from a trip of their own in Mexico.  They arrived at the search area Monday afternoon.

The search area is above 10,000 feet and is at the start of the highest paved road in the United States -- to 14,265-foot Mount Evans.  The road is drifted over with snow and closed in the winter but numerous hiking trails emanate from the parking lot where the road is closed.

Barwick said there are several scenarios for what may have happened to the pair:

--They dug a snow cave and have taken shelter into it.

--They succumbed to hypothermia and were covered by the heavy snowfall.

--They were victims of an avalanche.

A couple from Evergreen who was snowshoeing in the area on Monday, told 7NEWS they were sticking close to the Echo Lake parking area.

"It's treacherous back there, especially if you're not properly equipped," the couple said, referring to the backcountry and weather conditions.

The family has established a Facebook page to update friends and family on developments:  https://www.facebook.com/groups/302383249916629/

A year ago, a 23-year-old hiker named Mary Own injured her leg on Oregon's Mount Hood and spent six days alone before she was found.  She had made a snow cave to protect herself from the elements.

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