The CDC Hendrickson is my favorite version of the Hendrickson patterns that I tie due to the fact that it fishes well over the majority of the hatch. Great footprint and floats well. This is the first, and quite often last pattern that I reach for.
CDC Hendrickson Recipe
Hook: Standard Dry #12 Thread: Rusty Brown 8/0 Uni-thread Tail: Medium Pardo CDL Abdomen: Olive Brown/Sulfur Spectrablend (hand blended) Hackle: #14 Greenwell Wing: 2 Dun CDC