Manistee County MI
The shore of Lake Michigan here bows to the eastward, forming a sort of shallow bay, and Portage Lake lies at the deepest point of the bow, just inside of the shore of Lake Michigan, from which it is separated by a belt, thirty rods wide, of high, wooded hills. At a depression in this belt, about one mile south of the narrow, crooked and deep gully, which was the original water communication, now closed, between the two lakes, a channel was dug in 1871, and is maintained.
An effort has been made, and is still being made, to secure a harbor of refuge at this point.
History of Manistee, Mason and Oceana counties, Michigan 1882 H.R. Page