We started fishing a Callibaetis may fly emergence in the 1960s and 70s on Lake Solano on Putah Creek in old "Tucker Duck and Rubber Company" round float tubes.
Back then we used size 16 Hares Ear nymphs to cast to working fish in the surface.
We also used #16 Red Quill and #16 Adams dry flies.
This hatch came off in the summer around mid-day like clock work and it was very good fishing, especially if it was not windy.
The Callibaetis may fly is one of the most common and prolific may flies in North America.
I have seen this hatch from Nor Cal, Nevada, Idaho, Montana, Oregon and even British Columbia.
I think they range from a 12 to a 16 in size on average. I read that they get progressively smaller through the summer. Also I think they are bigger in BC, Canada like a size 12?
Wonderful still water hatch.....
Here is a link to a great article on the Callibaetis by Ralph Cutter:
http://www.flyline.com/entomology/callibaetis/
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