I've seen snow melt off three feet in a week in Surveyor on 80*-90* days here in the valley.
One year I remember drphil reprimending me (I'm sure he remembers too) for not telling him about "watching out for the exposed rocks" on the backside of the test hill when they were going in either the same weekend or during the week after I went in. I hadn't gave it much thought when I went in but the rocks coming off the backside of the test hill about a third of the way down when exposed are tough on a sled and or rider. Once you start down they are about to the point on spring snow that gravity takes over and you can't stop or go around them without hitting them. There used to be a large log in the way also.
Unless you know they are covered for sure you can either slip on a ski loop (belt) to control decent, hang as far right as you can near the trees, or hang as far left as you dare without falling off to the side (not a fan of this method).
If the backside of the test hill has rocks exposed then be very careful going off the hill that goes down into Kidd Lk. If you drop into Kidd the rocks will first start showing right after you start down the main trail into Kidd and in a spot you will "NOT" get stopped before hitting them (just after starting down the hill where the trail gets very narrow and gravity will not let you get stopped maybe even with ski loops). I normally like to go down in the trees to the left (over the bear grass and all) of the main trail and others drop in off to the right more on the ridge if you will.
Either way be careful as the exposed rocks can be half the size of trucks and they will win if you hit one.
When you start seeing rocks you will also star seeing exposed water on the outlet of Kidd Lk.
Once past Kidd the snow seems to hold good until you drop down in one of the creek drainages far enough. I've seen gophers while riding down there.lol