bait, I mostly fish springers in less than 18-20' of water as I think you will find most do. With the heavier flows of spring the salmon don't want to fight the current, they're a little on the lazy side. That's why they like the shallow water, less current. I've done well with a dropper of about 12-20 inches and a leader anywhere from 4 to 6 feet. Sardine wrapped kwikfish has been the ticket for me.
Try a search and type in springer fishing, you may want to check out the 2003 archives and then type in springer fishing and see what you get. A lot of great info from some of the best fishermen in these parts.