Copyright 2013 James Marsh
Hatches and Trout Flies for the Blue River, Colorado
The hatches are few and far between below the dam. Midges are the prime insect to focus
on in the tailwater for the first two or three miles downstream of the dam. Of course you
also have the mysis shrimp which are concentrated below the dam for the first two or three
miles. Click Here to see the Hatch Chart.
As with most trout streams the most important aquatic insect is the Blue-winged Olives or
baetis species. That's because of the overall length of time they hatch. They are
bi-brooded, hatching in April and about the first two weeks of May and then again in
September until about the middle of October.
Pale Morning Duns would be the next most important insect. They hatch starting about the
first of June. The hatch last through the month of July. The water levels can affect the
benefits of the PMDs during the early part of the hatch.
During the same time period, starting a week or two after the PMDs, you will find Dark Red
Quills hatching. The PMDs tend to hatch in the slow to moderate sections of water and the
Dark Red Quills tend to hatch from the faster sections of water. The Red Quill hatch last
until about the end of July.
The mayfly that gets the most attention on the Blue River is the Western Green Drake. It
starts to hatch about the same time as the PMDs and the Dark Red Quills or around the
first of June. It is shorter in duration and only last a couple of weeks, so it isn't exactly an
easy hatch to catch. You will find the Green Drakes in the more moderate sections of water
along with the PMDs.
The Little Yellow Stoneflies most anglers call the Yellow Sallies, hatch during July and
August. Imitations of both the nymphs and the adults can be very effective. There are a
few Golden Stoneflies in the lower section of the river.
From about the first of June until the middle of August you will find several species of
caddisflies on the Blue River. The majority of them are net-spinning species of the
Hydrosyche genus, or Spotted Sedges. There are hatches of their Little Sisters starting
about three weeks later than the Spotted Sedges start coming off.
Near the faster water you will find plenty of Green Sedges. The nymphs of these
caddiisflies (Green Rock Worms) work great in this river. There are several other species
of caddisflies. Starting in late April you will find some Brachcentrus or American Grannon
activity in the lower sections of the river. This hatch can produce some great dry fly action.
The Short-horned Sedges provide another good hatch of small black caddisflies during
June and July.
Terrestrial insects become important in late June. Fish can be taken on imitations of
beetles, ants and grasshoppers up until the first frost which usually occurs around the end
of September. Don't forget to have a selection of streamers, especially if you plan on
fishing the fall salmon run out of Green Mountain Reservoir.
We always recommend our own "Perfect Flies" because we think they are the best flies you
can purchase. We have specific imitations of everything the trout eat in the Blue River. We
encourage you to check them out. We know you will be satisfied with their performance.
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