"American
Grannom"
Brachycentrus
fuliginosus
casebuilding
caddis pupa
to reveal larval
form, place mouse over image
larva: 20-30 mm / pupa: 14 mm / adult:
.75" 
This is a major species on American rivers, particularly in the east. Larva live in swift riffles, and build tapered cases of plant fibers that are square in cross section. 5/8ths". Pupa develop in weedy shallows and migrate to surface to hatch. Close cousins of the Rocky Mountains & Pacific Coast tend to mix in with other insects.
Other casebuilding caddis: "Medium Cinnamon Sedge", "Giant Red Sedge" , "Great Western Caperer" , "Little Sepia Sedge" , "Medium Speckled Sedge"