The Adams was created in 1922 by Leonard Halladay of Mayfield, Michigan, tied for his friend Charles F. Adams. It was built as a general mayfly impression rather than a match for one specific hatch, and that versatility is why it has never left anyone's box. The parachute version came later, winding the hackle flat around an upright post instead of around the shank. It sits the fly lower and shows a crisper wing profile from below — a small change that makes a real difference on selective fish.
1. Thread base — Attach gray thread behind the eye and build a base to the bend.
2. Parachute post — At the 1/3 point, tie in a small bunch of white calf body hair upright. Build tight wraps around the base to keep it vertical — the finished post should stand about one hook-gap tall.
3. Tail — Tie in a small bunch of moose body hair fibers at the bend, hook-shank length.
4. Body — Dub a slender, tapered gray body from the bend up to the post base.
5. Hackle — Tie in one grizzly and one brown hackle at the base of the post. Wind both parachute-style around the post in descending turns. Tie off at the base and trim excess.
6. Head — Build a small head in front of the post base. Whip finish and apply head cement. Trim the post to one hook-gap height if needed.
