Fly Fishing the Big Hole River— The Spruce Moth Hatch

August is a wonderful time to be fly fishing thecan on the pattern you are throwing.
Big Hole River in Southwest Montana.  EveryoneYou will only find the Spruce Moths on or near
who has been chasing the Salmon Fly Hatchesbanks.  Rarely do the moths flutter in the middle
from river to river are now gone.  Evenings areof the river.   This hatch is one that every
getting cold and day time highs are warm.  Mostangler should fish when taking a Southwest
people think August is a hatchless month when flyMontana fly fishing vacation.  You will be amazed
fishing in Southwest Montana.how many trout are looking up to eat when the
Besides the hoppers, and ants, the one terrestrialmoths are on the water.  The trout eat so
hatch I look forward to every year is the Sprucemany Spruce Moths that I have seen them
Moth hatch on the Big Hole River.  The mothgorged on the meal almost like a Salmon Fly
lives inside Douglas Fir Trees and Lodge Pole PineHatch.
trees.  Once the forests have dried out from theSince this is a terrestrial hatch, you do not have
summer heat and lack of moisture they fly fromto fish a nymphal stage.  This is a great
the trees they dwell in, and flock to the river foralternative to fishing Tricos in August.  Slamming
a dip and become a meal for trout.   This hatchthe water with a fluttering Spruce Moth pattern is
has not always been around.a blast.  The time of year when the moths are
We have seen an increase in the Spruce Mothhatching is typically the first of August till about
population in the last 10 years.  This hatch on thethe 15th of August.  The best time to be on the
Big Hole River is in my mind the best and mostwater for the hatch is from 9:00a.m. - 2:00p.m. 
consistent hatch of the year, low clear water,Usually you will see a slowdown of moths on the
with fish looking up crushing spruce moths on thewater in the heat of the day.  Around 6:00p.m.
banks.  The spruce moth hatch does not occurthe moths will return to the water for another
on the entire Big Hole River.  It is concentrated infeeding frenzy.
the section where we have the most pine trees. This year the hatch is late just like all of our
From Jerry Creek fishing access to Maiden Rockhatches on Southwest Montana fly fishing rivers
Fishing Access is where you will find the Sprucelike the Big Hole River and the Beaverhead
Moth hatch.River.  We've had dry warm weather for the
Size #14 and #12 tan elk hair caddis are the bestlast 2 weeks so the hatch is just starting to pick
imitations for the Spruce Moth.  We tie them atup.   We have had a few Spruce Moths on the
the Sunrise Fly Shop with extra bushy elk hair. water this week with some fish keying into
The moth will flutter on the water, so in order tothem.  Look for the hatch to get going in the
make your pattern look like the real Spruce Mothnext 5 to 7 days and get ready for the best dry
you need to splay out as much elk hair as youfly fishing of the year on the Big Hole River!