The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 71 records from GBIF, adults of this species have mostly been collected during August (31%), September (28%), July (24%), and October (10%).
In 26 records from GBIF, this species has been collected at elevations ranging from 177 to 9186 ft, with an average (median) of 2822 ft.