It's Winter time, a time for tying flies, building rods, going to seminars and to shows after the first of the year.
HOWEVER, Don't put the rods away yet. Let's look at some of the alternatives:
The Arkansas River below Pueblo Reservoir;
Eleven Mile Canyon;
South Platte River;
Blue River below Dillon Dam;
Frying Pan River
These are all tailwaters that fish well at different times of the winter.
Don't forget your midges.