Copyright 2013 James Marsh
Hatches and Trout Flies for the Big Lost River Idaho
Hatches are very intense and diverse on the Big Lost River. The Blue-winged Olives start
hatching in late March and last until June but some of these hatches are wiped out by the
spring runoff. These mayflies hatch again starting in September and last through
November. Some very good dry fly action is possible, especially on nice warm cloudy days.
From the middle of June,July and the first half of August brings hatches of Pale Morning
Duns in many areas of the river. This is one of the better hatches.
Western Green Drakes hatch in some isolated area in June and early July. There are even
a few Brown Drakes that hatch the first couple of weeks in July.
June, July and the first half of August you will find hatches of different species of Spotted
Sedges. July, August and the first half of September brings on hatches of the Green
Sedges. Imitations of the larvae, or rock worms, work great year-round.
The Golden Stoneflies hatch from about the first of June through July. You may catch a
good part of the hatch after the stream settles down from the runoff. Even when the water
is still very high there are always some places you can catch trout on imitations of the
stonefly from the banks of the stream.
Salmonflies hatch about the first two weeks of July. This hatch can be good if you catch it
right. The Little Yellow Stoneflies, called Yellow Sallies, hatch in June, July and the first of
September brings on some hatches of Mahogany Dun mayflies. This hatch last into
October. Tricos start hatching in August and last through September. This hatch can be
very good in certain locations.
July, August and September are the best times to fish imitations of terrestrial insects. Ants,
grass hoppers and beetles are the main insects to imitate.
Don't forget the midges. They hatch year-round but become especially important on cold
days when nothing else is hatching.
One of the most popular types of flies are streamers. Imitations of sculpin, minnows,
leeches and baitfish work great at times, especially when the water is high and slightly off
As always, we recommend our "Perfect Flies". We have simi-realistic imitations of all
stages of life of all the insects on the Big Lost River. Our Stonefly imitations are the best
and most effective flies you can buy for the hatch. We hope you give them a try.
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Big Lost River Idaho
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