"Medium Speckled Sedge"
Heliopsyche
borealis
casebuilding caddis pupa
larva: 3 mm / pupa: 3 mm / adult 2.5
mm 
Medium size caddis larva that craft unique spiral-shaped cases of pebbles and tiny bits of shells. Found in sandy-bottomed still waters or eddies of slow-moving streams. As they pupate, gather in stones and seal cases to rocks in silken webs. Generally emerge in June & July.
Other casebuilding caddis: "Medium Cinnamon Sedge", "Giant Red Sedge" , "Great Western Caperer" , "American Grannom" , "Little Sepia Sedge"