The Ohio Department of Natural Resources has released their updated list of state endangered, threatened, special concern, special interest, extirpated, and extinct species (whew!). The link to the entire list (PDF) is here. The latest newsletter of the Ohio Odonata Society summed up the additions, upgrades, downgrades, and deletions for odonates:
Michigan's list is overdue for an update, and a brief explanation, the current Michigan list as well as other rare species and those of conservation concern, can be found on the rare species page of the Michigan Odonata Survey website.