S. Tom, I live right on the Sky, not far from proctor creek. Although I had to work this weekend , the Sky looked fishable. You can fish all the way up to like a thousand feet from the outlet of Reiter. Make sure first by checking the WDFW website. As far as I know closures start Monday.
As for your question on where the fish are biting. I've hooked a few at Reiter, But it's really strange this year. Usually I'll see a few boats run down past my place , putting in at the gravel pit and taking out at high bridge. A word of warning though. That run has a pretty high pucker factor. You better know what your doing up there. It usually holds fish though. I havn't seen any boats through there yet.(Drift boats and rafts)
I like fishing from High Bridge down to Sultan in January, but really much more starting about the second week in February. A lot of nates then. January on is usually great in front of my place. And also the first 2 weeks of June.
Just a suggestion, Getting a local guide for a trip or two, would give you a wealth of information. I had one run me down in front of my place before I tried it in my own boat. I'm glad I did!