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Disappointing Crowds on the South Fork of the Boise River

By Troutnut on October 23rd, 2025
Last week I hunted for mule deer in Idaho, and I eventually harvested a doe on my any-deer tag after trying unsuccessfully for several days to turn up a good buck. I wanted to leave myself at a day of good weather at the end of the trip to fish the South Fork of the Boise in the tailwater section below Anderson Ranch Dam, where I had a pretty good hour of fishing one time after a previous hunt. On that earlier trip, I had just stopped to look at the water, saw a few fish, stopped, caught them, and left. It didn't give me a full picture of the fishery but it left a good impression.

This time I had a full day plus the previous evening, so I got to explore the whole road-accessible reach. It's rare that I have a bad time on a beautiful western river full of trout on a clear blue day, but this came pretty close. Every pool has fish, but they mostly just weren't very active, and the rise activity was mostly near the slower tails of the pools, where a fish might rise just once or twice before cruising to a new spot. They were picky about what they'd eat, which is normally something I enjoy, but when they're moving around too much to allow more than a couple casts over the same fish, it's difficult to get dialed in.

Finding decent fishing was going to take some moving around to find active fish in more stable locations. That was incredibly difficult to do because there were so many people. A large majority of parking pulloffs had at least one angler's rig parked already, and most pools were occupied by a guy for at least a day. I didn't see anyone catching fish. Unlike some of the Catskill rivers where crowding multiple anglers on a pool is within the normal etiquette, in the West it just feels wrong, so I had to just keep moving to find unoccupied places. When I found them, they usually didn't have what I was looking for: a good place to find fish consistently rising in one spot, ideally with a bit of backcast room. Every time I spied a promising piece of water as I moved around, my motto for the day quickly flashed through my head: There's a guy there.

Only one time did I see a really awesome rise of fish, with many nice ones sipping something in a stable location off a gravel bar with nice casting room, which had been unoccupied a few minutes earlier as I fished an eddy downstream and prepared to move up. I was excited to look up at the water and see all the tantalizing rises... but, of course, because a few minutes had passed, there's a guy there. Exasperating. Not fun.

At least I caught some bugs.

Photos by Troutnut from the South Fork Boise River in Idaho

The South Fork Boise River in Idaho
The South Fork Boise River in Idaho
The South Fork Boise River in Idaho
The South Fork Boise River in Idaho
This fat 16 1/2 inch rainbow took a small BWO dun imitation.

Underwater photos by Troutnut from the South Fork Boise River in Idaho

Brachycentrus occidentalis larvae hold their middle and hind legs up into the current, letting the rows of tiny setae on their legs filter particles of detritus for them to eat.

From the South Fork Boise River in Idaho
The rocks in the fall were paved with algae-draped larvae of Brachycentrus occidentalis, representing a major hatch to come in the spring.

From the South Fork Boise River in Idaho

On-stream insect photos by Troutnut from the South Fork Boise River in Idaho

The South Fork Boise River in Idaho

Closeup insects by Troutnut from the South Fork Boise River in Idaho

Public service announcement: the October Caddis is not pumpkin orange

By Troutnut on October 3rd, 2025
A quick evening on the water in early October provided me with another fresh Dicosmoecus adult to photograph, and I was struck as always by the gap between the patterns commonly sold for this hatch and the color of the real insect. Even my photos, being taken up close with a bright camera flash, show the colors a bit brighter than how the real thing usually looks, except in bright sun. Yet they show a ginger-brown body and dark grayish-brown wings with even darker veins. See the "Imitation" section of my Dicosmoecus writeup for more discussion of the ideal way to match this hatch.

Photos by Troutnut from Mystery Creek #306 in Washington

Mystery Creek # 306 in Washington

Closeup insects by Troutnut from Mystery Creek #306 in Washington

Exploring a bunch of small-stream spots in the Cascades

By Troutnut on August 9th, 2025
Sunday August 9th was a scorcher in the Wenatchee area lowlands, so I drove up into the mountains to poke around some small streams I mostly hadn't visited or fished before. With limited or no information on any of them, I aimed to explore as many different places as possible in a day, while giving myself enough time to get a feel for the fishing in each one.

The first one was a dud. I was recently listening to the Troutbitten podcast, which defined a small stream as something like, "a stream no wider than the dirt road you drove in on." In that spirit I'd propose a definition of a tiny creek: "a creek where you can usually stand on both banks at the same time." Many of these don't have fish. A few do, and it's a great find when you can land a trout a third as wide as the water it came from—even when the fish is 7 inches long. Meadows work best for this, because they can fit a deep-enough channel, sometimes with undercut banks, into a tiny width. Satellite imagery drew me to tiny Smith Brook (near the popular trailhead named for it) as a prospect for this kind of spot, but like most such prospects, it didn't pan out. It's a beautiful tiny creek, but there's too little water even for tiny trout. The frogs have the place to themselves.

I checked out six or seven other spots on different creeks after that, and I found trout in all of them, but mostly not very many and not very big (even by small Cascades stream standards). One of these spots (labeled "Mystery Creek") held some nicer (9-10") fish and very good numbers of more typical small-stream cutthroat. A brook trout and a few rainbows made appearances in different sections.

Photos by Troutnut from Smith Brook, Mystery Creek #319, Lake Creek, and the Little Wenatchee River in Washington

As a fan of tiny streams and mountain meadows, I found this spot appealing on aerial imagery. However, it was a bit too small. Fishless.

From Smith Brook in Washington
Mystery Creek # 319 in Washington
My first brook trout of 2025, and the only one on a day filled with westslope cutthroat.

From Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
A fairly hefty westslope cutthroat for little creeks in this part of the Cascades
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Lower in this creek, a few little wild rainbow found their way into the mix

From Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Lake Creek in Washington
Lake Creek in Washington
Lake Creek in Washington
Lake Creek in Washington
Lake Creek in Washington
Lake Creek in Washington
The Little Wenatchee River in Washington
The Little Wenatchee River in Washington

Underwater photos by Troutnut from Mystery Creek #319 in Washington

Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington
Mystery Creek # 319 in Washington

Updates from July 5, 2025

Photos by Troutnut from Mystery Lake #317 in Washington

Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington

Updates from July 4, 2025

Photos by Troutnut from Mystery Lake #317 in Washington

Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington
Mystery Lake # 317 in Washington

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Streamside Field Guide
This field guide puts essential hatch-matching information at your fingertips wherever you have internet service. Pull up the mobile-friendly page to see the likely aquatic insects for your location and time of year, with pictures for quick identifications, highlights of each species' life cycle (timing, habitat, behavior), and tips for fly selection and presentation to catch more trout.
Identification Keys
Identify trout stream insects using the same scientific criteria as entomologists, but with features to make the job easier, including instant definitions of unfamiliar terms, extensive closeup photos, built-in range maps, example specimens, and easy backtracking. Whether you're a biologist, a bug-serious angler, or looking to become one, these keys will make insect identification faster and more fun.
Artistic view of a Male Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Cedar River in Washington
Mayflies
Ephemeroptera

Mayflies are the most important insects for anglers to understand, because they are common on trout streams, they often hatch in frenzied bursts of activity, and their behavior varies so widely between families and sometimes even species that it's useful to know and imitate the habits of each. They are a primitive order of insects, and their elegance and delicate lives have made them popular beyond the world of trout fishing.

Lateral view of a Female Grammotaulius lorettae (Limnephilidae) (Northern Caddisfly) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Caddisflies
Trichoptera

Some anglers consider caddisflies to be even more important than mayflies. On many rivers, they're right. Angler-entomologists focus less energy on them because they are slightly less prone to cause a feeding frenzy among the trout. Although that happens sometimes, they are more commonly an intermittent food source during the times when it seems like nothing's hatching. Understanding their life cycle is of paramount importance to any fly fisher, but learning their species-specific idiosyncrasies is less useful than with mayflies.

Artistic view of a Male Isoperla fulva (Perlodidae) (Yellow Sally) Stonefly Adult from Mystery Creek #295 in Washington
Stoneflies
Plecoptera

Though less prolific than mayflies and caddisflies, many stonefly species make up for in size what they lack in numbers. Because they emerge by crawling out of the water on land, the hatching adults are not eaten for trout, but their large nymphs are welcome food year-round. In the Western states, where stoneflies are most prolific, trout sometimes feed selectively on the egg-laying adults as they return to the water.

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