Streams Outside of Yellowstone National Park
.............................Fly Fishing Yellowstone National Park

12/15/08

Henry's Fork of the Snake River Hatches - Box Canyon - Part 4

The Box Canyon and Cardiac Canyon should be the same as the other sections of the
river as far as the species of insects are concerned but the hatch times will vary
slightly. Hatches in the Cardiac Canyon should take place just prior to those in the box
canyon since it is at a lower elevation.

If you read the previous articles on the Henry's Fork of the Snake River you would
know that the Box Canyon is fast moving pocket water as opposed to the smooth
flowing, spring creek type water in the Harriman State Park section. This makes a
difference in the insects that live there.

Again, I would like to refer you to the
hatch chart on our "Perfect Fly" website. I will
mention below the difference in what is shown and the Box Canyon section of the river.

The salmonfly hatch usually occurs near the end of May and ends around the first or
second week of June. The egg laying part of this hatch will be one of the few times dry
flies will work well in the canyon. Just as important, in my opinion, is the Golden
Stonefly hatch which starts before the larger salmonflies hatch ends and continues a
couple of weeks or longer after it has ended. Before the Golden Stonefly hatch ends,
the Yellow Sallys usually begin to hatch. You can expect to find plenty of stoneflies for
a long period of time from near the end of May through July.

The trout in the Box Canyon grow very large. They feed on leeches and sculpin in
addition to aquatic insects. That means that streamers work well just about anytime.
The summer irrigation demands affect the water flow through the canyon. The best
time to fish it is between the ending of the runoff near mid June until the middle of July.
The irrigation demands usually end around the end of August and the canyon
becomes less turbulent again. In other words, the fishing in the canyon is more
controlled by the water flow than the hatches. It is fishable during high water but it must
be done from a drift boat to be safe. Wading is very dangerous during high water
periods and should be done with caution anytime in the canyon.

All the mayflies and caddisflies are there except for the slow water species such as the
Speckled Wing Quill mayflies and the long horn caddisflies.

Copyright 2008 James Marsh     
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