As stated above, the road to postpile was closed but had one lane cleared for plowing and is scheduled to be open on the 18th. You could call and see if that has moved up.
I assume you are planning on going in from Agnew if you can get there. it could be snow the whole way from there.
I would say there is probably a 99% chance that Ediza is still frozen. You can't catch fish in that damn lake anyway unless you can huck way out there with a spinning rod (still bitter from getting skunked there last summer). If Shadow is clear you may have luck there. by the inlet or outlet if they are clear.
Please post back and let us know how it went. A friend is thinking of skiing Ritter, but the crazy weather has made him put it off.