From sun up to noon there is a marginal midge hatch. For the next three to four hours we are seeing lots of baetis or blue winged olives, then midges again until dark. There are caddis coming off on the lower river in the float only section, this is best in the last 4 hours of the day. I am also starting to see some PMD’s on the lower river in the afternoon but it won’t really take off for another week.
Many of the fish are moving into the faster water looking for mayfly nymphs. Try fishing these areas early with midges and then move to baetis nymphs around 11:00am. When you change over, start with just changing the upper midge to a mayfly and leaving the lower a midge. You may still pick up a few fish on the midge, when you start catching fish on the baetis change the lower fly to a slightly different mayfly. This will help you maximize the fish you catch during the hatch change.
Morning fishing has been marginal at best. The midge hatch has slowed way down in the morning and fish know the mayflies will be coming. Most of the fish seem to be waiting for the afternoon to get their days worth of food. Sleep in and get fishing around 9 or 10 and fish until dark, this is the most productive time of the day.
One of the hidden jewels of the San Juan is the lower river float and this is the best time of year to fish it. There is great dry fly and streamer fishing to be had. You need a boat and do not drop anchor or get out wading as the land owners own the bottom of the river. This is a great stretch to fish with a guide, at least the first time.
Fishing has not been as good above Texas hole as it has been down river although you can still do well is some places if you know where the fish are holding. Olive and cream midges have been working well for me where the fish are midging but most fish are looking for baetis, even early.
Good luck, Chris
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