This may give you some idea of streamflow, which should peak the last week of May or first week of June.
Middle Fork Salmon Snow-Stream Analysis | Idaho NRCS
Should give a similar peak runoff as 2003 if the snow, water equivalent and precip continue on as they have. I doubt the road will be open until the first week of June, but it is such a crap shoot with the cooler weather we have been having.
I have three trips posted up there from last year. Lake Creek is a mess and who knows what the higher flows will do to that corner.
Looking at the top post on the blog, shows just a few of the really big trees in the river last fall. All of these were between Powerhouse ( which burned ) and Lake Creek. There are probably 100 to 150 small trees in the river and 20 to 30 pretty big ones including three that we had to drag around on the side of the river.
There is nothing on the river that is class V up to 8 feet ( the highest I have done it ) Velvet is frightening to behold as you slide by the far left sneak. Of course the class 2 entry to the Velvet area becomes class 3 + and pushy. Hard to keep track of where you are too cause you are moving so fast. The other that was quite impressive was lower cliffside with the monster nearly river wide hole at that flow. Rubber was a sneak on the left. As mentioned Ski Jump is monster and there are some huge waves in Jack Creek one that nearly flipped my boss on the Chewbacca ( big 20 or 22 Mararvia ). Weber is impressive with ocean size waves, but easily missed with a center left entry and move right. You will float right over several things without knowing in the last ten miles.
Pistol always gets weird at high flows. I saw it reverse taco a paddle boat on the eddy-seam-hole thing that forms at 7 +
The flipper in the first mile is Murph's Hole. Big, big foam pile at higher flows. Hells half mile has some spectacular holes in it. Pretty much read and run if you are on your game. It pushes you right, but you can just miss on it the left. Seems like you can go far right almost to the bank there too.
I don't think I would want to do Marsh without knowing the log situation. Always subject to change.
I know a couple of brave souls who may be going out there this weekend or next week. They may fly in to Indian Cr which I think heard just cleared of snow on the strip, but I don't think anyone has flown in yet.
The high trip I did. We rigged and launched that morning. Left about 11am. Scouted Velvet and set safety so we mess around a bit. Had lunch at Sheepeater at 1:30. Ran down to Pistol. Drank gin and tonics for a while there. Went down to Sunflower and drank some more and still made lower Jackass before dark. Quite a day.
I will post back if I have any updates.