The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 52 records from GBIF, adults of this species have mostly been collected during October (25%), September (17%), November (13%), August (13%), June (10%), July (8%), and May (8%).
In 2 records from GBIF, this species has been collected at elevations of 164 and 1100 ft.