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The Gallatin River near Big Sky and Bozeman is flowing at a good level to cover a lot of water. Flows are slightly lower than long term averages but that hasn't stopped the consistent fishing action on the Gallatin. The best action right now on the Gallatin River is with tandem nymph rigs fished subsurface. See the list of flies below for the best choices. With the low, clear water for success you will need to drop down in tippet sizes so you are getting a better drift. Many anglers are going to 9 foot 5X leaders with 5X fluorocarbon for their tippets. Trout are being found in the 5-6 feet deep medium fast runs during most of the day.
Hatches of caddis are waning and a few PMDs can still be spotted hatching in the riffles and some Yellow Sally stoneflies are also being spotted, but the anticipation is high for spruce moths to pop any day now. What has been unique this summer has been an abundant hatches of Drakes. They are size 12-14 and have been mostly spotted hatching from the backend/shelfs of riffles from around 10 AM till about 2 PM.
As the river continues to drop and clear expect trout to become a little more selective in their feeding habits. With so much public access on the Gallatin River near Big Sky, anglers that are willing to hike a little from a common access or parking area are going to find more consistent fishing.
The Month Ahead:
The next month on the Gallatin River means the river will drop and clear, but the Gallatin River has some of the coldest water in southwest Montana because of the high elevation and deep canyon so it makes it ideal for anglers looking for plenty of DYI opportunities. Trout are going to be feeding in several types of water for the next few weeks. More fish are going to be found in riffles and deeper runs than along bankside structure.
Flies for the Gallatin River for the Next Month:
Lightening Bugs in sizes 16-18
Zebra Midges in black, red, or olive in sizes 18-22
Pheasant Tails in sizes 16-20
Chubby Chernobyl in black, olive, or royal in sizes 12-16
Little Spankers in sizes 18-20
Pat's Rubberlegs in sizes 12-14
Hi-Vis caddis in sizes 12-16