The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 104 records from GBIF, adults of this species have mostly been collected during June (27%), July (25%), August (20%), and May (16%).
In 34 records from GBIF, this species has been collected at elevations ranging from 7 to 2625 ft, with an average (median) of 699 ft.