The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 77 records from GBIF, adults of this species have mostly been collected during June (31%), July (25%), August (18%), May (12%), September (6%), and April (5%).
In 49 records from GBIF, this species has been collected at elevations ranging from 554 to 8530 ft, with an average (median) of 3740 ft.