DeWayne,
Hi, buddy! Yes, that is correct. Within 100'. This exception is relevant to Crawford county, where Pool 9 resides.
Other open water hunting constraints in Wisconsin are as follows.
You can only hunt open waters of Lake Michigan, Green Bay, Green Lake, the Petenwell Flowage, and Lake Winnebago. On Winne, there is a restriction as to how close you can hunt to shore. Something like 1,000 or 1,500 yards.
Wisconsin and Minnesota are the only two States that I am aware of, that have some sort of Statewide ruling on open water hunting. Chesapeake Bay has certain restrictions, as mentioned above.
God Bless,
Mark Rongers