As these hydrographs illustrate http://www.fs.usda.gov/Internet/FSE_...ev3_029251.pdf
, the Salmon (Main and Middle) is usually rising and can peak in mid-May so having enough water will not be an issue. Be prepared for rain, sometimes pretty constant. Will be low hanging clouds, drizzly, etc. 3-5 feet is a great level. We've run it at 6 and 7 in early June though in those ranges it's really flushing. Nice wave trains, etc. but not as enjoyable as lower flows and of course it's fast and cold and hazardous swimming if a big hydraulic gets you. I'm told 5 feet is actually the "sharpest" level insofar as crunchy holes, etc. At 6,7,8 its big and pushy but manageable if you stay T'd up and run conservative (i.e. go around the big ones, don't be a hero).