"Medium Dark Olive Sedge"
Macronema
aspila
free-living caddis larva
to reveal the pupal form, place mouse over image
larva: 3 mm pupa:
3/4" adult 2.5
mm 
These are relatively large caddisflies as free-living forms. They are recognizable by their dark green "shoulders" and bright green body. The pupal form is similar in color. They are found in quick moving currents of shallow streams. Pupation occurs within a silken shelter that is wrapped in an oval shape of anchoring pebbles.
Other
free-living caddis:
"Little Orange Caddis" , "Dark Grey
Caddis" , "Western Olive
Sedge" , "Small Spotted
Sedge"