CDC & Elk

This is a very simple fly created by Hans Weilenmann in the 1990s.  The CDC & Elk is a variation on the Elk-hair Caddis that is both easy to tie and versatile.  Using only two materials, you can churn out a few of these in relatively short order. 

Pattern:

Hook: Dry Fly (12 or 14)
Thread: Brown
Body: Dark Dun CDC
Wing: Elk Hair (Deer hair subbed above)

Instructions:

1. Starting your thread a little behind the hook eye, wrap back to the barb and trim your tag end.
2. Holding your CDC feather in your left hand, stroke the fibers forward with your right-hand and tie in the first 1/4-1/2" of the tip per Hans' technique: two pinch wraps on top, one wrap in front around shank only, then another wrap on top.
3. Advance thread forward to an eye space or two from the eye.
4. Using a hackle pliers, wrap the CDC forward to your thread.  The rear end of the fly will be nicely dubbed as the CDC fibers are all trapped.  As you advance, more and more fiber ends will be freed up and create a leggy/buggy look.  Be sure to stroke these fibers rearward as you wind.
5. Tie off CDC behind eye and trim.
6. Select a small clump of hair (I like to hold mine to the hook shank before cutting to help gauge size), remove fuzzy under-fur and use a stacker to line up the ends.
7. Size the wing such that the deer hair ends even with the bend of the hook.
8. Per Hans, pinch the butts at the hook eye and trim the hair square at the hook eye.
9. Maintaining your pinch grip, tie in the hair with two pinch wraps and tighten down forming your nicely balled head.  A third wrap should go at 45 degrees through the head ball and a final wrap around the hook shank only, under the head and behind the eye.
10. Whip finish and cement.  (This is a great pattern to practice whip finishing by hand.  The control you get by hand allows you to get the whip finish under the head much more easily than you would with a tool.)

And since my summary could never equal learning from the creator himself: 

Fishing the CDC & Elk:
As an elk-hair caddis variation, this fly is ostensibly a dry caddis imitation.  However, per Hans, it's useful for prospecting, can be successful as a mayfly imitation, makes a decent emerger when a bit damp, and can be swung as a wet fly as well.  I'm looking forward to trying the CDC & Elk this season.  A quick and easy tie that covers several different scenarios?  How can you go wrong?

For more on CDC patterns: Tying with CDC