Thx. Haven't fished it in 20 years.
Of course everyone wants perfect conditions. That's part of the problem these days. Since there's so little else open, and the level info is instantly available, everyone and their brother with a steelhead itch will hit the river when it nears "perfect". Can't blame them; it is what our steelhead fishery has evolved to.
I guess what I'm saying is don't expect it to be like what it was 20 years ago.
I wouldn't necessarily wait for 2000cfs. You can fish it around/under 3 if you're a bit selective on your spots. A lot of the color comes from the claybanks -not the glacier- so consider going higher.
Good luck when you go. Not much better than steehead fishin'.