nymph
San Juan Worm
- Sizes
- #12–#16
- Imitates
- aquatic worms · Tubifex worms · earthworms
- Origin
- San Juan River guides, New Mexico, 1980s
The San Juan Worm is the most controversial and most effective simple fly in the game. A tuft of Ultra Chenille or Squirmy Wormy material on a hook, it imitates aquatic worms that trout hoover up after rain events and high water. Purists scoff, but the fish don't care.
Recipe
Workbench
Variants
Swipe to see In box and Add
| Size | Bead | Body | In box | Add to box |
|---|---|---|---|---|
| #12 | 3–3.5mm · tungsten · Small tungsten | — | — | — |
| #14 | 3–3.5mm · tungsten · Small tungsten | — | — | — |
| #16 | 3–3.5mm · tungsten · Small tungsten | — | — | — |
At the vise
Tie a length of Ultra Chenille or Squirmy Wormy material to a curved hook, extending past both ends. That's the whole fly.
Tying video
Fishing now on
Rivers whose hatch chart names this pattern this month. Names and sizes only.
Not named on this month's hatch charts.
On the water
Dead drift the San Juan Worm along the bottom during or after rain events, high water, or anytime worms are active. It is especially productive as the lead fly in a double-nymph rig, with a smaller midge or mayfly nymph as the dropper. Don't overthink it.
History
Named after New Mexico's San Juan River, where it became infamous in the 1980s. The tailwater below Navajo Dam releases nutrient-rich water that supports enormous populations of aquatic worms (Tubifex and Lumbriculus). Local guides discovered that a simple chenille worm pattern was the most consistent producer on the river.