Good advice, I already had a situation earlier this year where I landed in a sloped stubblefield I'd been in maybe 20 or 30 times earlier in the fall. I eyeballed the stubble sticking up out of the snow, and deemed it "not that deep". It wasn't, maybe 6" or 7" at most, but the freeze/thaw cycles had left a crust that was pretty damn grabby. It was like landing in Elmers Glue! The slow down was dramatic, but the tail didn't get light, the takeoff was a different story; I accelerated...and then didn't anymore, even though on a 15% downgrade, not until I got in my landing tracks. The "drop one wheel in" technique, kinda like sticking one toe in a hot tub, seems to give me some feeling for what it is going to be like before getting all slowed down and committed. I drag one wheel until its solid, then go around and eyeball the track, and then make up my mind. To tell the truth I am more concerned with breaking through the ice, as these ponds and reserviors are stream and spring fed, and not consistantly frozen. I did that once as a kid in Michigan, no thanks! I also shot a few landings today on two other large reserviors (Chesterfield and Blackfoot) and each time I played around quite a bit before slowing down, no surprises yet. I also have been experimenting with lifting one wheel on takeoff, kind of like a float plane, so far that doesn't seem worth the effort.