The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 25 records from GBIF, adults of this species have mostly been collected during May (20%), September (20%), August (16%), October (16%), June (8%), July (8%), and April (8%).
In 16 records from GBIF, this species has been collected at elevations ranging from 770 to 8005 ft, with an average (median) of 5030 ft.