I think this is Hyaloscotes fumosa based on information in “Bagworm Moths of the Western Hemisphere” U.S. National Museum Bulletin 244, 1964.

“Antennae with approximately 29 segments; pectinations extremely long, slender.” “…broadly bipectinate; pectinations decreasing in length gradually toward apex, arising from middle of each segment, tending to arise more apically in segments in distal third…”

Wing expanse 26-30 mm, “…broad, translucent, evenly, thinly covered with long, sharply acute, hairlike scales, giving wings a light fuscous to greyish color…”

“foretibia with slender epiphysis” (apical spur) Note: other Hyaloscotes have no epiphysis.

MPG - See here showing Mount Shasta/Siskiyou Co., CA record.