Copyright 2013 James Marsh
Hatches and Trout Flies for St. Vrain Creek
Remember the elevation of the St. Vrain Creek changes drastically from the headwaters of
its three branches to the foothills. Hatch times vary considerably with changes in elevation
due to varying water temperatures. Keep in mind our time tables cover the entire spectrum
so the hatch at any one area may not be near as long as the period of time stated.
The BWOs, or Blue-winged Olives, consisting mostly of baetis species hatch during April
and May. These are bi-brooded insects and hatch again about the middle of September
through October. They are as important as any mayfly on this stream. The next most
important mayflies are the PMDs or Pale Morning Duns which hatch from about the last
week of June through August.
Western March Browns hatch during the month of April. These mayflies are very plentiful on
the St. Vrian Creek. Green Drakes hatch during the months of July and August. This hatch
varies depending on the location on the creek and the type of water. Red Quills also hatch
during July and August. These mayflies are very plentiful in certain areas.
Golden Stoneflies hatch from about the middle of June into the month of August depending
on the location and elevation. Little Yellow Stoneflies, or Yellow Sallies, hatch from late May
Brachycentrus Americanus or Little Black Caddis, referred to as the Mother's Day Hatch in
many Western streams, start hatching in late April. The hatch generally last about three
weeks but progresses upstream each day.
Arctopsyche grandis, or the Great Gray Spotted Sedges, hatch during the month of July.
These are very large caddisflies.
Hydropsyche species hatch throughout the summer. They are the most plentiful of all the
caddisflies on the stream. Imitations of their larvae, pupae and of the adults will catch trout
throughout the summer months. They hatch from June through August.
Helicopsyche borealis, or the Speckled Peter Caddisflies, hatch during June. They can be
very plentiful in certain areas.
Several species of Green Sedges, or Green Caddisflies whichever you prefer, are present.
It includes the Rhyacophila acropedes. The larvae of these caddisfiles are called "Rock
Worms" and imitations of them are very effective just about anytime of the year. These
caddisflies hatch from about the middle of May until through August.
Terrestrial insects become very important from about the first of July through the month of
September. Imitations of grasshopper, ants, and beetles will all catch trout.
Streamers can be important flies to use during low light conditions, or when the water is
stained from rain or melting snow. The stream has a large population of Sculpin, so
imitations of them are always choice streamers.
As always, we recommend our "Perfect Fly" trout flies. They are the most realistic and most
effective trout flies you can purchase. If you haven't already done so, please give them an
opportunity to prove their effectiveness to you. We are confident that you will be glad you
St. Vrain Creek
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