General studies : November, 1967 / by John C. Ayers, Joseph C. K. Huang.

7

shore at Livingston Road, but at the south edge of the survey it
again lay at 1000 feet off shore.
Maximum water depth of 5-6 feet is present between the inner
bar and the shore. Twelve to thirteen feet of depth is the
greatest that was measured between the two bars.
Outside the crest of the outer bar the bottom falls slowly;
20 feet of depth is attained at about 1700 feet off shore at the
north edge of the plant property. Over the rest of the detailed
survey about 1800 feet from shore was needed to reach 20 feet of
depth.
The depth over the crest of the inner bar is about four feet.
The outer bar peaks at 8-9 feet beneath water surface.
Bottom Stability
Our own bathymetric surveys in May, June, and July plus an
additional visit to the site on 13 September all showed the two
sand bars to be in the same positions and with the same depths
of water over their crests and in the troughs.
This suggestion of stability of the bottom, insofar as
possible migration of sand bars is concerned, is in agreement
with the findings of Davis and McGeary (1965). In June and
August of 1963 they carried out detailed underwater studies of
the topography and sediment distribution in two sites in Michigan
on southeastern Lake Michigan. One of their study sites was in
Berrien County, the other in Allegan County. The Berrien County
site was between Union Pier and Bridgman, Mich.
Davis and McGeary found that no distinction existed between
data collected before and after this two-month interval in surmmer