I'm headed to alice springs and wondered if there was any potential for a big downwinder there
sorry! couldn't resist the temptation. Unfortunately your situation is about as dire. The salt river is in the environs of Phoenix, and has a few stretches that are paddleable in the wet season, (even fewer in the winter) but it is still kind of a nasty slough. Can't really think of much else amenable to the ski. I did find a livery called sonoran outfitters that rents boats, but i seriously doubt they would have much but poly rec boats, not ski's. you might check out their site though cause it does have photos of the river and some contact info