Just returned from the Main Salmon on Sunday. Great trip as always. The Main is my all-time favorite river trip. I doubt that you'll have enough water for a jet back in September, but who knows??? They were still running through Salmon Falls last week. Don't forget your Idaho Invasive Species tags. They're required on every boat, including hard shell kayaks. Duckies under 9 ft. long are exempt. There were several groups of rangers on the river last week doing camp clean-ups, and they were checking for the tags. There was even a boat check station on the freeway at the Utah/Idaho border to check all boats. They're serious about keeping those pesky snails out of Idaho waters I guess.