Mastering Small Flies on the San Juan: How to Stick More Fish

Summer on the San Juan River means clear water and trout scrutinizing your drift. When the fish are keyed in on midges and other micro-snacks, you’ve got no choice but to downsize. Tiny flies — 24s, 26s, even smaller — can absolutely make your day. But let’s be honest: they can also make you want to throw your rod in the river if you’re missing eat after eat.

We guide with small bugs thought out the season, and here’s the truth: hooking fish on them isn’t an art form or rocket science, its technique. Below are the pitfalls most anglers run into and the fixes that’ll help you stick more trout.

Why Small Flies Miss Fish

Most anglers tie their dropper straight off the bend of the hook. It works… sort of. The problem? That knot sitting on the bend kills your hook gap. When a fish eats, your hook doesn’t have the room it needs to drive home. End result: a lot of white-knuckle sets that turn into “see-ya” moments as your fish swims away.

Guide-Tested Fixes

Here are a few adjustments we use every day on the San Juan to turn those missed strikes into trout in the net:

1. Go Wide on the Hook Gap
   Pick hooks designed for small patterns with a little extra bite. When we tie our midges sparse on wide-gap hooks, hookup percentages go way up.
2. Keep It Slim
   Bulky midges are pretty, but slim, minimal patterns hook fish better. Less fluff = more steel doing its job.
3. Set Smarter, Not Harder
   Skip the big trout-set. Try a side-sweep when wading and straight up when out of a boat. You’ll be shocked how many more fish stay buttoned.
4. Rethink Your Rigging
   Instead of choking the bend, tie your dropper to the eye of the top fly. Your hook stays clean, your gap stays open.
5. Fish Upstream
   If you can, feed your flies from above. When a trout eats, you’re in the perfect spot to drive the hook in. Downstream drifts often just pull the fly right out.

The Right Tools for the Job

• Flies: Think size 24–26 midges, nothing fancy.
• Tippet: Trout Hunter 5.5x or 6x fluorocarbon is our daily driver.
• Weight: A single micro split shot is often the difference between floating over fish and feeding them.

Final Word from the Rower’s Seat

Fishing tiny flies on the San Juan isn’t just a game of patience — it’s a technical dance. With the right tweaks to your rigging and hook set, you’ll stop just “educating” trout and start netting them. If you want to better understand the small-fly game with guides who live it day in and day out, we’ll be here for you when you’re ready.

— James Garrettson, About Trout Fly Fishing