1. Portage Lake, Manistee Co., Lake Michigan Yale Public content 1931. 2012-04-20T14:40:21Z. 2015-10-21T15:22:09Z. U.S. Lake Survey. On sale at U.S. Lake Survey Office. English. Public. Portage Lake (Manistee County, Mich.), Onekama (Mich.), Michigan, and Portage Lake (Manistee County).