That's the hard way. The year up north when we had to quit maintaining boundary lines because the old evidence was buried was like that pic, but a stiff stick (straight sapling 1" thick was best) could be shoved down thru the crusts and give a much easier measurement. That's how I got the 80" depth the day after that year's big March dump.
Phin - Lynx are moving south. When I worked in the NW part of Maine (76-85), trappers caught only bobcats, now only lynx (which all but a very few have been released angered but otherwise unharmed.) Those tuft-eared kitties are doing so well that the USFWS may petition to have their threatened status ended, at least for the MN/NNE populations. (Opponents probably have a 200-paragrph lawsuit ready to go if that happens. When the timber harvesting rules for the Northern long-eared bat were posted, the lawsuit came on the same day. Only 161 paragraphs, though.)