COLLBRAN, Colo. | Laser and radar technology is being used to remap the area of a massive mudslide in western Colorado, where three men are still missing.

Mesa County officials say two days of flights over a large area from Collbran to Vega Reservoir are underway. About 87 flights over the area will remap the topography of the slide and are aimed at getting a better sense of the new landscape.

The half-mile-wide by 3-mile-long slide, which was triggered May 25, is about 11 miles south of Collbran.

A memorial service is planned in Collbran on Sunday afternoon for the three missing men — 51-year-old Clarence “Clancy” Allen Nichols, his 24-year-old son, Daniel Allen Nichols, and 46-year-old Wesley “Wes” Melvin Hawkins.

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