If the new Kern River Fly Shop May 2026 report is anything to go by, fly anglers heading into California's Sierras have walked into one of the kinder Upper Kern windows in years. Guy Jeans hosts the report and starts it the way every fly fisher would want, locked into a strong rainbow on a swung streamer.
"That looks like a 18 to 20 in fish right here," Jeans calls as the fish thrashes in the shallows. "Oh, he busted me off. That's what you get when you don't have a net."
The headline numbers favour wading anglers. "This is April uh in 2026 and you can fish the upper Kern River right now," Jeans says. "It's actually down to about 900 and then up above the powerhouse it's even lower. So it's like around the 400 level. So you got 15 mi of 400 and then down below into town it's about 900 to a thousand."
That ladder of options runs deeper than the main stem. "You also can fish the lake for bass and crappie which is amazing," he says. "Or you can go up into the creeks and we have hundreds of miles of creeks to explore where you can catch golden trout, brown trout, golden rainbow hybrids, that sort of thing."
The streamer program gets a long, hands-on tutorial. Jeans rigs a sinking leader with three feet of 2x tippet, then runs two streamers separated by a dropper tag rather than tying off the hook shank. "I don't really like tying off the hook shank," he notes, before laying out the casting plan. "I'm going to cast into the current here, let my fly swing around, and then strip them back upstream kind of in the eddy line and uh see if a fish will pick it up."
The 10-foot 6-weight Sage Arrow does the heavy lifting. "It picks a line up off the water. It's 10 ft. And it casts amazing." Within a few drifts the rod loads on a swung fly. "That was on the swing. He was down a little ways. That's a nice fish, man... 15 16 inches for sure. He's fired up."
For anglers who would rather work nymphs, Jeans walks through the four programs that have been producing in May 2026. "You could straight nymph, Euro nymph. Use an indicator and put some split shot on, get your flies down, or use heavily weighted flies. So those are some of the techniques that you can use. They are all working."
The fly box is classic Kern. Yellow sallies in mixed colours, golden and brown stoneflies, hare's-ear soft-hackle jig nymphs, psycho mayflies and Euro Iris in sizes 10 to 12. Streamer wise, three patterns earned the airtime: a Crelex, a basic olive bugger, and a tailed Jawbreaker.
The hatch read comes from Dana at the shop. "I've been seeing some hatches uh just some smaller stonefly exoskeletons about size 10 and 12. Also I've been seeing some catis coming off," she says. "Now the water below the Fairview Dam is under 300 CFS or so. So very manageable and a good place to fish."
For anglers planning a Sierra trip in May 2026, the Kern's signal is hard to miss. The tailwater is at a soft, very wadeable level, the in-town run is the strongest dry-dropper water of the year, and the upper river above the powerhouse offers 15 miles of light, fishable flows. With caddis emerging and stones holding through the warming days, every program in the box is on the menu, and the streamer swing is, in Jeans' showing, already lighting up the bigger fish.