Hatches are difficult to predict
with any real level of precision in the Rockies, many variables
contribute to the performance of the varied species of aquatic
insect. Snowfall levels from year to year will have immense impacts
on instream flows, and temperatures, all of which will have an
effect on incubation times, as well as growth and survival rates.
Despite that, we are confident in predicitng that specific hatches
will occur within a given time frame +/- about 1 week. The degree
or intensity of the hatch however is better determined at around
30 days prior to the actual expected event.
Upper Bow River
Banff
National Park
Lac
Des Arcs
Kananaskis
Lakes
Barrier
Lake
Hector
Lake
Gap
Lake
May Midges (dry & wet). Blue Olives last week of the month other
Mayflies present. Large Caddis flies.
June Common Brown Stones begin to show, Midges still very much prevalent.
BWO's & Pale Morning Dun's, Some Caddis.
July Grey Drakes Sz 8&10, Green Drakes (1997 hatch began July
9th and peaked July 13 to 25 and remained into August). BWO
all through the month. Stone flies - Goldens and Browns peaked
July 1 to July 16 (shorter than usual years). Blue Duns begin
to show.
August Heavey hatches of Blue Duns begin daily at about 3:30 pm and
continue until sundown all month. Midges, Brown Drakes and some
Green Drakes. Hoppers begin showing August 14th (intense by
I 8th and continue through into mid September
September Terrestrials (land bugs!) predominate mid day periods during
hot, sunny and windy weather. Blue Duns and Midges for sundown.
Trico's begin showing last week of the month.
October Large Caddis, Midges, Blue duns and occasional Trico
Headwaters of the
Eastern Slopes
Oldman
River
Livingstone
and tributaries
Crowsnest
river
May Midges (dry & wet). Blue Olives last week of the month other
Mayflies present. Large Caddis flies.
June Common Brown Stones begin to show, Midges still very much prevalent.
BWO's & Pale Morning Dun's, Some Caddis.
July Grey Drakes Sz 8&10, Green Drakes (1997 hatch began July
9th and peaked July 13 to 25 and remained into August). BWO
all through the month. Stone flies - Goldens and Browns peaked
July 1 to July 16 (shorter than usual years). Blue Duns begin
to show.
August Heavey hatches of Blue Duns begin daily at about 3:30 pm and
continue until sundown all month. Midges, Brown Drakes and some
Green Drakes. Hoppers begin showing August 14th (intense by
I 8th and continue through into mid September
September Terrestrials (land bugs!) predominate mid day periods during
hot, sunny and windy weather. Blue Duns and Midges for sundown.
Trico's begin showing last week of the month.
October Large Caddis, Midges, Blue duns and occasional Trico
link to Crowsnest River
hatch chart
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