The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Time of year : March to October; LaFontaine reports peaks in late June and in September
Preferred waters: Best in spring creeks
In 23 records from GBIF, adults of this species have mostly been collected during July (35%), August (30%), May (13%), June (9%), and March (9%).
In 4 records from GBIF, this species has been collected at elevations of 6060, 6250, 6726, and 7005 ft.
Substrate: Vegetation