The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 141 records from GBIF, adults of this species have mostly been collected during September (18%), August (15%), October (15%), July (13%), May (12%), and June (11%).
In 12 records from GBIF, this species has been collected at elevations ranging from 246 to 1083 ft, with an average (median) of 620 ft.