The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
In 114 records from GBIF, adults of this species have mostly been collected during July (24%), June (21%), August (18%), May (14%), September (11%), and April (10%).
In 93 records from GBIF, this species has been collected at elevations ranging from 131 to 8914 ft, with an average (median) of 5194 ft.