Where is the Fishing Year's Best, Now?

We'll start the year off with a little quiz/riddle.

Of all the great flyfishing (not ice fishing) places in America, I'm thinking most are, naturally, almost dormant for the long winter stretch.  Oh, to be sure, there are many places where the fishing is okay or good now, but they're going to get a whole lot better in the coming months.

But one place is going off, right now.  It's prime time, when the biggest fish of the year are well within range, and when conditions are right, you can catch them in numbers.

Where am I thinking, and what fish are they catching?

And if you know of someplace else that's hot, right now... let us know.

Happy New Year.

Deeter