The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 51 records from GBIF, adults of this species have mostly been collected during June (22%), August (20%), July (20%), September (18%), May (8%), and October (6%).
In 32 records from GBIF, this species has been collected at elevations ranging from 650 to 5764 ft, with an average (median) of 2522 ft.