Fig. 1. Sampling sites on Lake St. Clair and the Clinton River in Michigan. Sites 1 through 11 were sampled in the present study. Sites 12 through 14 are relevant sites discussed from other studies (Selegean et al., 2001; M. Samadpour, unpublished data [microbial source tracking study of the Blossom Heath Beach, report for Macomb County Department of Public Works, 2001]).