There are plenty of ways to rig for salmon & steelhead and many of them have been covered in many posts in the past..but we are talking about Springs, and NOT coho, chum, pinks, or steelhead. Contrary to what you may have heard, Springs are not big "Chasers" of bait or gear. But, they will take almost anything that is put right in front of their noses and is not travelling too fast.
Hook is correct, they will not usually spend too much time in shallow water or "exposed water"..They like a good flow from 2-6 feet with lots of aireation (upstream boulders or choppy water)
The trick is to keep your offering in front of the fish as long as possible. Do this by staying upstream and slowly letting a bit more line out..Don't let the float go free thru the run, as it will usually be too fast. oNLY FISH 10 30 FEET AT A TIME. YOU WILL NEED A HEAVIER WEIGHT THAN NORMAL DRIFTING. Sllde whatever float you want on the mainline, thread on a piece of pencil lead (do not crimp), add a single bead to keep the weight from crimping your line, then tie on a swivel, then add 12-18 inches of leader with a size 1-4 barbless hook tied on with a roe knot.....has worked for 50 years and worked twice on Friday........Ortho 8)