Just spent last weekend at Big Arsenic camping and fishing. I see the flow dropped from1,200 to 900. 900 was always the flow that I would see the most kayaks doing it back in the day. I didn't see anyone putting their life on the line Saturday, Big A looked real mean Friday night, it came down in that 36 hours. But I've always been blown away by it. Too much gray in my hair to be on that water.
IMO, 1200 is a much better level than 900 for the Upper Box. It hides more sieves and cleans up most of the lines (with the exception of NCO). We ran on Friday on our way through a self-support and the flow was much better than on Sunday.