I had some trouble working through the genus key for this one because I'm not great at interpreting caddis wing emergence. Fortunately, figure 19.707 in
An Introduction to the Aquatic Insects of North America (Fifth Edition) shows the distinctive color pattern of the striking forewings on
Hydatophylax argus, which is a perfect match for the pattern as well as emergence. As there are no other species in that genus in this area, I can be pretty confident in the species ID.