LeechPolar Chenille Leech
The Polar Chenille Leech is a guide box staple from Kyle McCallum, designed for the San Juan River and beyond. This simple yet effective pattern combines a tungsten drop bead with polar chenille to create a jigging action and subtle translucency that trout find irresistible. The straightforward construction makes it an excellent choice for tyers of all skill levels.
Year Round
Beginner
Trout
Dec 2025
Overview
This AboutTrout pattern by guide Kyle McCallum showcases the effectiveness of simple materials combined thoughtfully. The drop tungsten bead creates a jigging motion that brings the fly to life while the polar chenille provides translucency and subtle movement. The jig hook design keeps the point riding up to reduce snags on the rocky bottom of tailwater rivers like the San Juan.
Materials
Hook: Fulling Mill Jigforce, #12
Thread: UTC 140 Denier, black
Bead: Fulling Mill Drop Tungsten Bead, silver, 3.5mm
Tail: Marabou, black
Body: Polar Chenille, black
Behavior & Presentation
Natural Behavior: Tailwater leeches display jigging motion as they alternately swim and sink, their semi-transparent bodies revealing internal movement. Active swimming phases make them conspicuous in complex underwater structure.
Where Trout Eat It: Trout intercept jigging leeches in San Juan River tailwater runs and channels where the drop tungsten bead creates distinctive up-and-down motion. Fish feed on leeches during active swimming phases when sustained movement makes them noticeable in complex underwater structure.
How to Fish It: Euro nymph with tight-line contact using 5X-6X fluorocarbon, maintaining direct connection to detect strikes. The 3.5mm silver drop bead adds flash and creates jigging action. High-stick through runs following drift with rod tip.
Best Water: San Juan River rocky bottom runs, tailwater channels with moderate current, and pockets where the jig hook design keeps point riding up to reduce snags on cobbled substrate.
Strike Type: Detect firm takes as solid weight or line draw during the jigging motion—set with quick strip.
Fishing Strategy
Rigging Suggestions: Fish on a euro nymphing rig with 5X-6X fluorocarbon tippet. The 3.5mm tungsten drop bead provides adequate weight for most presentations. Works well paired with smaller nymphs as droppers.
Seasonal Timing: effectiveness with particular success on tailwater fisheries where trout feed on leeches throughout the seasons. The dark profile works well in both clear and slightly off-colored water.
Pro Tips: The silver drop bead adds flash while providing weight for the jigging action. The black polar chenille creates a translucent profile that mimics natural leeches while the marabou tail undulates enticingly with each movement.
Entomology
Leeches in tailwater environments display a distinctive jigging motion as they alternately swim and sink, their semi-transparent bodies revealing internal movement. Trout in these rich waters feed selectively on leeches during their active swimming phases because the sustained movement makes them more noticeable than stationary prey in the complex underwater landscape.
- Organism Type
- leech
- Life Stage
- general