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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

By Troutnut on June 25th, 2019
Our trip up Slough Creek began at the crowded trailhead with a single parking space open. We walked up the road far enough to verify that the creek was in fishable shape, because we were still prepared to leave and move to a mountain lake as a backup plan if needed. The water was still high from snowmelt runoff, but it was reasonably clear and looked inviting anyway.

The beginning of the trail climbs over a small ridge before dropping down to the river at the downstream end of a large meadow a mile and a half from the trailhead. We passed many day hikers coming back down this trail, some with fishing rods and disappointed looks on their faces. As we arrived at the river, a thunderstorm was narrowly missing us to the northwest, keeping the lightning at a safe distance but casting enough clouds overhead to prompt an emergence of small blue-winged olives (Baetidae) in a large, slow eddy where the trail first meets the river. Several small trout were rising, and we snuck up and caught a few.

We continued up to the trail to set up camp at the Hornaday Creek campground, 5 miles from the trailhead. We had it all to ourselves, an upside to the park's system of camping by reservation only. In fact, we saw very few other people beyond the first couple miles of the trail at all, and no other anglers on the water. The creek is clearly less popular during runoff than it is a few weeks later when it drops, clears, and becomes a prime dry fly destination, which might be why I was able to get a camping permit at all.

We still had time for some evening fishing and hiked down to the river below camp. At the first pool we came to, we missed several strikes and lost a couple good fish on streamers, but none were landed. This seemed to bode extremely well for the rest of the trip, but when we moved up to new pools the action subsided. Another nasty storm was rolling in and chased us back to camp; at the time, we blamed the storm for the inaction in the other pools.

Photos by Troutnut from Slough Creek in Wyoming

Slough Creek in Wyoming
We were lucky to be able to fish through this storm as it skirted around us to the north, giving us just enough clouds to prompt a BWO hatch but keeping the lighting at a safe distance.

From Slough Creek in Wyoming
First pool on Slough Creek up the trail. We encountered a Baetidae (BWO) hatch here in a slow eddy, in just the right weather, and started working on rising fish right away. The fish were all small, and we caught a few, in the only dry-fly action of our four-day backpack trip.

From Slough Creek in Wyoming
Slough Creek in Wyoming
The trail up Slough Creek is one of the most well-trodden in the Yellowstone backcountry, but it still didn't feel crowded at all once we got beyond the first meadow.

From Slough Creek in Wyoming
Bison along the Slough Creek Trail.

From Slough Creek in Wyoming
Natural elk skull alongside Slough Creek

From Slough Creek in Wyoming
Slough Creek in Wyoming

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