Boulder River Rainbow Trout
Photo Courtesy Steven Lamb
Copyright 2016 James Marsh
Fly Fishing On The Boulder River In
Montana
The Boulder River starts in the Absoraka-Beartooth
Wilderness in the Gallatin National forest. It's a tributary
of the Yellowstone River. This river has a wide diversity
of water types from its headwaters down to its lower
valley section. The lower section flows through open
areas of land near the town of Big Timber.

From the Boulder River headwaters downstream for
about twenty miles, the river consist mostly of fast,
pocket water with lots of plunges, fast rapids, riffles and
runs with some pools. This section has mostly rainbow
and cutthroat trout. Lower downstream it begins to fall
on a  lower decline and the water slows down to a more
moderate speed with longer sections of riffles with larger
and deeper pools.

It flows over the hundred foot high water falls at the
Natural Bridge State Monument and then begins to slow
down even more as it flows through agricultural land.
The section below the falls downstream for about ten
miles flows through private property without any access.  
Farther downstream it picks up the water from the East
Boulder River at the Forks and begins to speed up to
some extend through more open and wider areas of
pocket water.

The lower sections of the river contains some very nice
size rainbow and brown trout ranging from about ten to
twenty inches. Much of the fishing done below the falls is
done on a drift boat or raft. The water above the falls is
very difficult to float in anything but a kayak. We don't
suggest it at all for fishing purposes. Below the falls,
downstream of the confluence of the East Boulder River
the river can be fished from a boat, but the upper
section is still quite fast. The lower section of the river
slows down and can be fished from any type of drift boat.

Fly fishing the Boulder River is as good as most any
stream in the United States. It is just surrounded with
many more fine trout streams most of which have been
published much more than the Boulder due to its lack of
commercial establishments. It is one of Angie and I's
favorite Montana streams. We highly recommend it.

Seasons:
The season is the general Montana Season
Spring:
Springtime is only good prior to the runoff
Summer:
Summertime is the best time for fly fishing the Boulder
River
Fall:
Early Fall season is usually excellent

Season closes 11/31/13
Type of Stream
Freestone

Species
Brown Trout (Wild)
Rainbow Trout (Wild)
Cutthroat Trout (Native)

Size:
Small - Medium

Location
South West Montana

Nearest Towns
Big Timber

Season
3rd Sat. May - Nov 30th

Access:
Good

Special Regulations
None

Non-Resident License
State of Montana

Weather
National Weather Service Link

Fly Fishing Gear, Tackle and
Trout Flies
Boulder River Montana
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Boulder River Fishing Report:
11/07/13 Customer reporting Boulder River
fishing good using our PF
Blue-winged
Olive nymphs. Catching several trout per
day. Brown trout spawning.
(Bottom Of Page)
Fishing Report Updated 12/06/16
05/14/14 Season closed until the third
Saturday in May of 2014. Check back next
week for our first fishing report for the new
season.
Options For Selecting Flies:
1. Email us (sales@perfectflystore.com)
with the dates you will be fishing this
stream and we will send you a list of our
fly suggestions. Please allow up to 24
hours for a response.

2. Call us 800-594-4726 and we will help
you decide which flies you need.

3. Email us (sales@perfectflystore.com)
with a budget for flies and we will select
them to match the budget and get them to
you in time for your fly fishing trip.

All orders are shipped free in the
U. S. Orders over $50 are shipped via
Priority Mail.  
05/21/14 The general trout fishing season
is now open but the stream levels are high
due to the warmer weather.
05/28/14 Stream levels still high and will
be that way for the next few days.
06/11/14 Stream levels are in much better
conditions but still a little high. It is getting
warmer and insects are hatching. We have
no reports from anyone fishing.;
06/18/14 One report from an angler
catching a few trout and buying flies. The
water is still cold and few hatches have
started. It is muddy downstream of West
Boulder, but clearing in the headwaters.
USGS Real-time Stream Flow Data:
Boulder River at Big Timber
07/10/14 The stream levels are down and
fishing is really good. Several stoneflies and
mayflies are hatching along with some
caddisflies. Three good reports from
customers fishing this past week.
07/23/14 More good fishing reports from
the past week. Levels are good and plenty
of insects are hatching.
07/30/14 No reports came in from last
week but the water levels are good and the
weather is excellent.
08/13/14 Stream levels and other conditions
are great and lots of trout are being caught.
09/03/14 Fishing was good until the water
levels came up. Give it a few days to subside.
09/24/14 Customers are reporting great fishing
with plenty of hatches still taking place.
October Caddis should start any time now.
10/08/14 The water has been high at times
but we have received some very good reports
for the past two week.
10/15/14 Stream levels have been on the
high side for the past few days. No reports
of fish being caught.
10/22/14 One report from a local angler
catching a few trout on  our BWO nymphs.
10/29/14 Another good report from a
customer who fished the Boulder this past
week. The water was a little high but
streamers worked (our
Brown Sculpin)
11/05/14 No reports from last week but
conditions are currently better.
11/30/14 Season Closes tomorrow
04/28/15 Give us a call or send us and
email to help you plan your next Boulder
River fly fishing trip
05/26/15 The season opened last Saturday
with some high water levels. Keep a check
from the link on your upper left.
06/09/15 Still in runoff but falling.
07/07/15 Runoff is over and the stream back
in good condition. Lots of insects are
hatching including stoneflies, mayflies and
caddis.
08/04/15 Excellent stream levels, good hatches
of PMDS, Little Yellow stones, and Spotted
Sedges . Terrestrials working.
08/11/15 We are getting reports of up to 50
rainbows a day. Great conditions. It will be
warmer this coming week.
08/18/15 Lower water levels has slowed the
"catching" down some. It is going to be much
cooler this coming weekend & that will help.
08/25/15 No reports from anglers fishing but
the conditions are the same - low water levels,
some hatches but warming back up.
09/01/15 It is cooling off and that will improve
the fishing opportunity. It will change the
aquatic insects that are hatching, so stay in
touch. The river is just a little low but otherwise
fine.
09/08/15 The river is flowing at a normal and
good level for this time of the year and
wading is easy. There are still some hatches
but terrestrials are also a good option.
09/15/15 The river is on the way up with rain
forecast through Thursday. It will be much
cooler and that should help big time.
09/22/15 The river was high for a day or two
but back down to a good, normal level. Great
weather and there are still some hatches.
09/29/15 Great conditions exist right now.
The weather is going to be cooler this coming
week. October Caddis should begin to hatch.
10/07/15 One good report came in this past
week. Customer caught several nice
rainbows and a large brown on our October
Caddis pupa.
10/13/15 Lots of October Caddis are
hatching and trout are taking the adult egg
layers from the surface. Brown trout are
spawning.
Boulder River Map
10/20/15 The Boulder has produced well for
one of our customers this past week. October
Caddis are at the peak of their hatch.
10/27/15 Stream levels still in good shape
for wading. Blue-winged Olives are hatching
good and in two sizes, 20 and 16.
11/03/15 The water temperature is going to
take a plunge this week. Hatches will mostly
be BWOs and midges.
11/10/15 The stream levels are fine and the
water still warm enough for trout to feed
good. No reports from the past week.
11/17/15 Lots of snow forecast for this week
but mild temperatures. BWOs and midges
will hatch under these conditions. Should be
good.
11/24/15 There's a storm warning in effect
through Thanksgiving day. We didn't receive
any reports from anyone fishing this past
week.
12/01/15 Should be a good week for fly
fishing the Boulder. Highs in the forties
and no snow or rain. Fish midges in
tandem and the Brown Sculpin streamer
and you should catch trout.
12/08/15 The weather is going to take a big
swing this week. There is rain and snow
forecast every day. Winter stoneflies are
hatching.
12/15/15 The river water temperature in
down in the high thirties with ice around
the banks. It is going to be tough but
midges could work.
12/22/15 The water temperature is from 39
degrees down to freezing. The conditions are
tough but not impossible.
12/29/15 The water is about 37 degrees and
below in some areas. We recommend you
choose another destination at this time.
01/05/16 It is going to be a little warmer this
week with lots of snow. You may be able to
catch some trout on the lowest section.
01/13/16 There is a lot of snow in the
forecast everyday. Fish the lowest section
with midges or a nearby tailwater would be
even better.
01/19/16 The highest water temperature to
be found on the Boulder is 35 degrees. There
is lots of slush ice and ice along the banks.
01/26/16 The water is still too cold for you to
have any reasonable chance to catch trout on
the Boulder. Now is a good time to plan your
next trip. We can help you with that:
sales@perfectflystore.com
02/02/16 Same story, second verse. The
warmest water in the Boulder river is only
reaching the mid thirties, a couple degrees
above freezing. Select a nearby tailwater.
02/09/16 The weather is going to be a little
warmer this coming week but there is far too
much ice to melt and we still don't recommend
fishing on the Boulder River yet.
02/16/16 The levels are fine but the water still
very cold. You might try cream midges or winter
stonefly nymphs in the lower elevations.
02/23/16 The warmer weather has melted a lot
of snow and ice in the Boulder river watershed
and this has the water very cold and stained.
03/01/16 The water has cleared up some and
gotten a degree or two warmer but it is still cold.
Another week of good weather is ahead with
little snow, so maybe things will change soon.
03/08/16 The stream is still flowing at a good
level and clear, but there is a lot of snow
changing later to rain in the forecast this
coming week. The river is sure to rise some.
03/15/16 Good stream levels still exist but it is
back to midges as the only real choice. The
water temp. is only in the high thirties.
03/22/16 The river is at a good level, but it is
cold water. The warm spell is over and there is
snow in the forecast every day.
03/29/16 The stream level is normal but the
water is very cold, at 37 degrees in the lower
part of the river. Midges are about the only
choice. Fish slow water current seams..
04/05/16 The Boulder is in as good of shape
as possible at this time of the year. It will be
warming up and melting snow this week.
Sculpin streamers will work.
04/12/16 The river is currently blown out and
there is more rain coming through Friday. It will
be a few days clearing and dropping.
04/19/16 The stream level is still high and the
water stained. This is unlikely to change with
more warm weather and rain coming this week.
04/26/16 The Boulder is very high and stained
badly. There is rain forecast everyday and this
is unlikely to change. Keep a check on it.
05/03/16 Stream levels are still high but
clearer and getting warmer. The Mother's day
caddisfly hatch is a few days away at the most.
05/10/16 The river is high and dirty and likely
will remain that way for the coming week.
There is little to no opportunity for fishing.
05/17/16 The stream level is still a little high but
dropping. There's more rain and it may again
go back up. It is gradually getting warmer.
05/24/16 The river is still high from spring runoff
and lots of rain and will be in this condition for
the next several days.
05/31/16 The flows are high and most likely will
get higher due to the warmer weather in the
forecast. Right now it can be fished, not waded.
06/07/16 The river is flowing at 3360 cfs at 5.96
feet or blown out. This is from both rain and
runoff and should continue all week.
06/14/16 The stream levels has dropped some
but it is still high and very dingy. The runoff isn't
over yet, so expect some more high water.
06/21/16 Stream levels are way down and
getting into good shape. Lots of stoneflies,
Salmonflies and Goldens, are hatching.
06/28/16 The flows are down to 653 cfs at Big
Timber, which is a good level. Lots of insects
are hatching and conditions very good.
07/05/16 Stream levels are down in good
shape and wading possible many places. Lots
of insects are hatching and fish being caught.
07/12/16 The stream levels are still down,
offering plenty of places to wade safely. There
are mega Golden stoneflies and llittle Yellow
stonefly hatches, as will as many other insects.
07/19/16 Stream levels are way down and
wading possible about anywhere. We are
getting some very good reports from
customers. Lots of insects continue to hatch.
07/26/16 The river is still low and very warm,
especially on the middle and lower ends.
There is some rain forecast the next two or
three days, and it is needed.
08/02/16 The river is running a little below
normal but there is some rain in the forecast.
Lots of hatches are taking place. Fish the
upper and middle sections, early and late.
08/09/16 The Boulder River is under Hoot Owl
restrictions from Natural Bridge to the
confluence of the Yellowstone River. You
cannot fish after 2:00PM.
08/16/16 Still under Hoot Owl restrictions. Fish
early mornings with sculpin streamers.
08/23/16 There is an EMERGENCY CLOSURE
OF A PORTION OF THE YELLOWSTONE
RIVER and all of its associated tributaries
starting 8/19/2016. Boulder Creek is closed.
08/30/16 Still closed.
09/06/16 The closure associated with the
Yellowstone River has been dropped and the
river reopened for fishing. The stream level and
weather forecast looks good for the coming week.
09/13/16 The stream is flowing a little low but
otherwise, in good shape in all sections. BWOs
are starting to hatch good. Terrestrials are
working good.
09/20/16 The stream is still a little low but it is
raining and will continue all week. October
caddis and Mahogany duns are hatching.
09/27/16 The stream levels are running just a
little below normal. There are plenty insects
hatching and fish being caught.
10/04/16 Good conditions exist with BWO and
October caddis hatching good. Brown trout are
entering the pre-spawn mode.
10/12/16 We had a good report from a customer
this past week. He caught a 24 inch brown trout
on our Brown sculpin. Good BWO hatches.
10/18/16 The river is just a little high right now
and tough or impossible to wade in most places.
It is falling and there's little rain forecast.
10/25/16 Stream levels have been good and
about normal but it is on the way up some.
Blue-winged olive hatches are going good.
11/01/16 Stream levels dropped some last week
but are back up to high to fish. Watch the levels.
Otherwise, everything is still in good shape.
11/08/16 Stream levels are still high, too high to
wade safely. Give it another day or two to fall.
11/15/16 Still too high to wade and turning
much colder. Cream Midges and small BWO
nymphs. Brown sculpin streamers will work good.
11/22/16 Stream levels are still up high enough
that it is unsafe to wade most sections. The
water temperature is in the low forties.
11/29/16 Fishing will be tough due to very cold
weather and snow. Highs will not be over
freezing. Water temperature in the high 30's.
12/06/16 The season is over. Send us an email
and let us help you plan the 2017 season.
sales@perfectflystore.com