Below any dam right now would fish ok. Cheesman Canyon is running at 170, below Spinney is hardly running at all and shows ice and the Blue below Dillon is running 70 cfs.
If I had to choose I would go with the canyon, Below Dillon has limited opportunities, at the factory outlet is the best place. The canyon is tough, those fish know your name, address and telephone number, but its mostly sight fishing and you can move around. Plus I know the canyon pretty well. I can mess around with a dry while you yank a streamer through the runs.
This will Not be a 20 fish day, 3 or 4 at best this time of year. But if you want to wet a line...i'm in.
If you are really feeling spunky we could run down to the San Juan. Pretty much a 3 day trip but you would catch a lot of nice fish. That would be hard for me right now. Maybe in a month or so.