.............................Fly Fishing Yellowstone National Park


I am calling this series Yellowstone Journals and Additional Information. It is a collection of a
rambling mixture of experiences on the streams with some notes, tips and additional
information thrown in. Some of this comes from my video tape logs (record of video shot)
and  notes made on my daily note books.

Fly Fishing the Upper Madison - Part 5

Today, I am continuing with the hatches that take place on the Madison River in
the park. So far we have only mentioned mayflies and stoneflies. The most
important hatches certainly include caddisflies. They could be the most
important hatches for several reasons. One reason is the fact they last so long.  
Another is the fact that some of them are very prolific. They blanket the water at

There are several species of caddisflies that hatch on the Madison River.
Because of the rich water chemistry, it is a caddisfly factory. The two main
species, or I should say, one group of species, the Spotted Sedges, and the
White Miller species represent the majority in terms of numbers. The
Ceratopsyche hatches, called Spotted Sedges, consist of several species. They
hatch from the last of June through the middle of August in huge numbers. The
White Millers, or
Nectopsyche species, hatch in the spring from about the first
week of June until near July and again in the late summer and early fall from
middle of August until mid-October.

The first major caddisfly hatch is the
Brachycentrus species called the American
Grannoms. They are hatching when the season opens and can last through
June. High, off colored water can destroy the first of this hatch but it strictly
depends on the snow pack and the weather conditions during the early season.  

There are also hatches of several different species of Green Sedges, from the
Rhyacophila genus. These don't hatch in huge quantities but they hatch off and
on from about the first of July through the rest of the season.

There are three other caddisfly hatches worth noting that occur on the Madison
River in the park. One is the Longhorn Sedge, or
Oecetis species. They hatch
the last two of weeks in July.

The Short-horned caddisflies, mainly the
Glossosoma montana species, hatch
during the month of July. Althougth these are little hook size 20 caddisflies, they
can hatch in huge numbers and become important.

There is the Little Brown Caddisfly, or
Lepidostoma pluviale species, that
hatches from about mid-July to mid-August. It too can hatch in large numbers
and be important.

If you fish the Madison River in the park, you better  be prepared to fish the
caddisfly hatches. If not, you are going to miss a big part of the fishing it has to
offer. Tomorrow I will cover some of the strategies and methods used to fish
these hatches.

Copyright 2009 James Marsh