Copyright 2015 James Marsh
Hatches and Trout Flies for Slough Creek- Yellowstone National Park
The hatches on the lower part of Slough are usually fairly large. There is an abondance of
insects in the lower section. The lower meadow sections of the stream have some aquatic
insects that are not present in the other areas of the stream. All of the creek has decent
hatches but the largest ones are in the lower section between the Lamar River and the
Blue-winged Olives are hatching when the water first clears. There are several species
including the baetis. There's an early season baetis hatch during June and the another hatch
that begins about the middle of August and last until the season closes. It is unlikely you can
fish during at least most of June.
Like most other western trout streams, PMDs, or Pale Morning Duns, are the most consistent
hatches of the mayflies on Slough Creek. They are usually hatching when the water first clears
and last until about the first of September.
Spotted Sedges are very plentiful, especially in the meadow sections. They start hatching
around the middle of June and last through September. Green Sedges are very plentiful in the
fast water sections. Species of these caddisflies hatch from about the first of July all the way
into October. Little Short-Horned Sedges hatch during the second half of July.
Gray Drakes hatch from about the middle of July through most of September. This hatch
occurs in the meadow sections of the stream. Pale Evening duns, or Heptagenia species of
mayflies, hatch from about the middle of July until the middle of September.
Brown Drakes are one of the better mayfly hatches on Slough Creek. They hatch just about
the same time as the Gray Drakes.
Near the middle of July hatches of Green Drakes should start occurring. This can really turn
the trout on. This hatch can as long as the middle to the end of August, depending on the area
of the stream. Flavs, or Small Western Green Drakes, hatch from about the middle of July into
September. There's a Fall hatch of Green Drakes that starts around the middle of August and
can last through most of September.
Salmonflies are present in the fast water sections. They start hatching about the second week
of June and can last until almost the end of July. Golden Stoneflies will start hatching about the
same time period. They will be present in good quantities in the fast water sections of the
Slough Creek. Yellow Sallies, or Little Yellow Stoneflies, are also plentiful. They start hatching
the first part of July and last until the second week in August.
You will find Yellow Quills, or the Eperous species, hatching from about the end of July through
August. Western March Browns start hatching about the same time and last through August.
Both of these mayflies prefer the faster sections of the stream such as the riffles and runs.
Grasshoppers, ants and beetles are very plentiful in the meadow sections of Slough Creek.
The high grass along the banks of the meadows are a perfect habitat for them. Imitations of
these insect will work during most of July, August, September. Don't forget to have some flying
ant imitations. If you should happen to encounter them, you will be very disapointed if you don't
have any because the fish can really turn on during an flying ant fall.
You should always have a few streamers. They can really come in handy at the first of the
season but they are also effective at catching the larger cutthroats under low light conditions.
We recommend our Brown Sculpin. Scuds are also present in this stream and you may want to
have a few imitations of them.
Our "Perfect Flies" have proven to be more effective than any of the generic or attractor flies
for Slough Creek. We have specific imitations of everything that hatches and in all stages of
life that the trout eat them in. You will find the Gray and Brown drakes very effective along with
most of the other common mayflies, caddisflies and stoneflies. If you haven't already tried
them, we certainly hope you will. Check out our Japanese Beetle. It has proven very effective in
the meadows of Slough Creek.
Slough Creek, YNP
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