The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 157 records from GBIF, adults of this species have mostly been collected during June (19%), August (19%), July (18%), May (18%), September (11%), and April (10%).
In 91 records from GBIF, this species has been collected at elevations ranging from 26 to 9186 ft, with an average (median) of 2904 ft.