Reports of lameness and deformed hooves in free-ranging Roosevelt elk (Cervus elaphus roosevelti) have occurred sporadically in southwest Washington for over a decade; however, the apparent number and geographical distribution of these reports increased dramatically in 2008. Informal surveys conducted by Washington Department of Fish and Wildlife (WDFW) staff during the winter of 2008-2009 revealed that up to 80% of observed herds in the area contained affected individuals. Within affected groups of elk, between 30-90% of the elk were lame or had deformed hooves, with a wide variation in the severity of individual cases. Both sexes and all age classes, including calves, appeared to be affected. Interviews with several large animal veterinarians who practice in the affected area did not reveal the existence of a similar condition in domestic livestock.