Notice the similarities between aquatic and terrestrial insect activity during September on the South Fork and the lower Henry’s Fork. The same applies to streamer pattern effectiveness. Look for these similarities to continue through October. These fall off some for the upper Henry’s Fork where aquatic insect hatches are more diverse and brown trout are absent. BWO activity and responding trout in any of these locations is reliable this time of the season.
Flow out of Palisades Reservoir has been steady at about 4000 cfs for a week. Good BWO activity and flow stability has kept fishing success up. Fall colors are making for beautiful scenery. October also brings notice that streamer fishing will be increasingly successful as brown trout migrate to spawning areas from Palisades Dam down through the length of the river.
Early AM tricos provide action on the Teton River. Later in the day BWOs take over. Look for terrestrial insect patterns to become less effective as colder weather takes over. The same will soon apply to the lower and upper Blackfoot River with respect to terrestrial insects if the stretch of predicted bad weather brings a killing frost. Forget trying small streams until next spring. They are now too cold and low to offer good fishing.
With unsettled weather coming up, streamer fishing for migrating browns is becoming very attractive whether from Warm River to Ashton or Ashton Dam on downstream past St. Anthony. Early or late in the day will be best regardless of weather.
Thanks to colder than normal weather including some snow and killing frosts, hopper season is about to end on just about every park stream. So if you pursue big fish, streamers or big nymphs will get best results. This applies to Lower Gibbon, Madison, Lewis, Bechler, Fall, Snake, Lamar, and upper Gardner Rivers. Other than that, good top water fishing is reduced to the Firehole River where BWO and white millers make for good daytime fishing especially during unsettled weather.
For still waters, action on Beulah Lake is slowing because of cooling water. Wait a few weeks before trying Trout Lake. Some of the best lake fishing will be along Lewis Lake shoreline where wading to pitch streamer patterns (especially below the campground) can interest migrating browns and an occasional juvenile lake trout. Weather and physical condition permitting, carrying a flotation device with all accoutrements down the DeLacey Creek Trail to Shoshone Lake will get you into juvenile lake trout foraging around sunken weed beds. Use a full sink line, black or olive leech patterns, and dress for the weather.
Flow out of Palisades Dam was dropped from just under 5000 cfs to 3940 cfs ( down to 4930 cfs at Heise, to 2070 cfs at Lorenzo) last night. This drop opens up even more wading opportunities along the river. With unsettled weather coming in a few days, there are more walk-in wade locations to enjoy fish responding to the current BWO activity.