Fast, Broken Water Needs a Fly That Won’t Quit.
Heavy riffles, pocket water, current seams churning white. This is where a standard dry fly gets pushed under and stays there. The Stimulator was built for exactly this kind of water, and the Hot Spot version adds a bright body that’s easier to track when the fly is bouncing through foam and broken current.
Randall Kaufmann popularized the Stimulator in the 1980s as a stonefly pattern for big western rivers, and it’s stayed in fly boxes ever since. It floats high, it’s tough to drown, and it reads as something worth eating whether or not a specific hatch is on.
Why It Floats Through Anything
The wing and tail are stacked elk hair, one of the best buoyant materials there is. The hollow fibers trap air and barely absorb water, which is why the wing keeps the fly riding high through riffle after riffle. The body is palmered with hackle wound the full length of the fly. That much hackle spread across the body is what makes a Stimulator bob back to the surface even after getting dunked in a wave.
The fine wire rib locks the hackle in place so it doesn’t unwind after a few fish, and it adds a segmented look to the body that resembles a real stonefly’s abdomen.
Why “Hot Spot”
This version swaps the standard olive or yellow body for a brighter chartreuse or orange made from UV fluorescent material. Under a blacklight it glows outright. In normal daylight, that same fluorescent quality means the color reads brighter and stays visible longer than a standard dyed body, especially in low light, overcast skies, or off-color water after a rain.
How to Fish It
Size #8 matches the big Salmonfly and Golden Stonefly hatches on rivers like the Deschutes and the Madison, typically late May through June. It also holds up better in high, off-color runoff water where a smaller fly disappears. Size #10 is the all-around choice. It covers mid-size stoneflies and big caddis through summer, and works as a hopper pattern once August rolls around.
Chartreuse shows up best in low light, overcast skies, and early morning. Orange works better in bright afternoon sun and slightly stained water, and it doubles as a decent hopper color in late summer.
Dead drift it through riffles and pocket water first. If fish look at it and turn away, add a small twitch to make it skitter a couple inches across the surface. That move imitates a stonefly or caddis trying to take off, and it can turn a refusal into a strike.
Common Questions
Does it need floatant? Not right away. Elk hair and palmered hackle float fine on their own for the first several casts. After landing a fish or two, squeeze the fly dry and apply a paste floatant to the hackle and wing.
What tippet should I use? 4X to 5X nylon. The fly is large and heavily dressed, so 4X turns it over cleanly in fast water. Use 5X on flatter, clearer water. Stick with nylon over fluorocarbon since nylon floats better.
Stonefly imitation or attractor? Both. During an actual stonefly hatch, trout key on it directly. Outside of hatch windows, it works as a general searching pattern, especially in fast water where fish strike quickly at anything large drifting by.
Specs
| Spec | Detail |
|---|---|
| Hook | Loop eye, 2X long dry fly hook, barbed |
| Hook Sizes | #8, #10 |
| Wing & Tail | Natural elk hair |
| Body / Thorax | Synthetic dubbing, chartreuse or orange |
| Body Hackle | Palmered natural rooster hackle |
| Rib | Fine wire |
| Recommended Tippet | 4X-5X Nylon |
| Target Species | Rainbow, Brown, Brook Trout, Smallmouth Bass |
| Best Water | Fast riffles, pocket water, freestone rivers |
This UV fluorescent body is incredibly bright on the water. I fished the chartreuse version in some slightly turbid, post-rain water yesterday and the cutthroats were spotting it from deep down. Super easy for my eyes to track too.