20 Incher Stone

20 Incher Stonefly Nymph

The 20 Incher Stonefly Nymph is a proven Western stonefly pattern originally developed in Colorado and widely fished throughout the Rocky Mountain region. Designed to imitate large stonefly and salmonfly nymphs, this versatile attractor pattern is available in Standard, Bead Head, and Double Bead styles, allowing anglers to match varying depths, current speeds, and fishing conditions.

Its buggy profile, natural movement, and large silhouette make it an excellent searching nymph during stonefly activity and throughout the year in rivers, freestone streams, and tailwaters. Whether fished shallow, deep, or in heavy currents, the 20 Incher consistently attracts aggressive strikes from larger trout.

A longtime favorite among Western anglers, this pattern excels in fast water, deep runs, riffles, pocket water, and rocky structure where stonefly nymphs naturally occur.

Key Features
- Proven Colorado stonefly attractor pattern
- Available in Standard, Bead Head, and Double Bead styles
- Excellent salmonfly and stonefly imitation
- Effective in fast and deep water
- Great searching nymph for larger trout
- Productive in rivers, streams, tailwaters, and freestone water

Available Styles
- Standard – Natural presentation for moderate depths and slower currents
- Bead Head – Added weight and attraction for deeper presentations
- Double Bead – Maximum sink rate for fast currents, deep runs, and getting to the strike zone quickly

Imitates
Stonefly nymphs, salmonfly nymphs, and large aquatic insects

Sizes
#06 – #14

Fishing Tips
Fish deep under an indicator, tight-line through riffles and seams, or as part of a tandem nymph rig. Use the Standard version in shallower water, the Bead Head version for general nymphing situations, and the Double Bead version when extra weight is needed to reach trout holding deep in fast currents.