I will be going to snowbank lake in 2 weeks. I will be fishing mostly bass and northern. What can I expect for bass fishing? What is the water temp and what are the bass doing? Are they going up to beds or preparing to go onto beds. How is the northern and bass population? I have not fished lake trout ever but heard that there are also those in there. Is it worth trying for lake trout and if so what should I use?

For lakers, I'd put on a large, hairy jig - 1/2 to 1 oz, like a white/white&blue one, figure out the wind so that you can have a not --too- crazy drift. Drop the jig down and reel up quickly and/or jig in a more exaggerated way than you would for walleye. Hard to say as far as depth - I'm guessing anywhere from 25-60', that's why I'd recommend drifting. But on Snowbank if the heavy wind kicks up I'd prob not do that in a canoe - make sure conditions are good.
Bass, I'd hit any of the rocky shorelines from 6-12'. You might get smallies and walleyes in some of the same spots and conditions. There are also some largemouth in Snowbank, though I never caught one.
Northerns - just about anywhere, from 20' down to the shallows, like Snowbank Lodge's docks.
By the big island where it drops off suddenly to like 100', you might see some baitfish stirring up the surface. Try a spoon or something (disclaimer it didn't work for me but I cling to that being a good idea :) )

Do you ever tip your large hair jigs with live bait or just jig them bare?

Probably couldn't hurt; the hairy jig I mostly used had a stinger and i used it by itself. But I have used a larger jig head and for a body attached a Zoom Lizard. Caught a laker and a decent northern that way.