NPSpecies

Report of sighting and photo from 1980s was likely that of a dark-skinned garter snake. (E. o. obsoleta formerly known as E. obsoleta.); Data Source: Casper, G. 2003. Johnsson et al. 1982

Usual range is 100 miles south of Lake Superior and southern half of Lower Peninsula.; Data Source: Holman et al. 1993

One photograph record reported. Location of photograph is unknown.; Data Source: Johnsson et al. 1982

Park Species Detail: An individual of this species may have been brought to the island by a visitor, but more likely, this was a dark-skinned common garter snake., Park Species Data Source: Holman, J. A., J. H. Harding, M. M. Hensley, and G. R. Dudderar. 1993. Michigan Snakes. Michigan State Univ. Museum. East Lansing, MI. p.43. Johnsson, Robert G., Shelton, Philip C., Jordan, Peter A. 1982. Wildlife of Isle Royale: Isle Royale Natural History Association.