There are no HP restrictions there. The public ramp is in the back of a narrow channel. It can be a little sketchy getting through when the water is low, but doable. Just take it slow. I've got a 20ft lund and have done it several times. There is also a nice ramp at the fairgrounds, but it requires a season pass for $75.
There is some nice structure around the lake and I've always down well fishing the weed edges.
The South End provides useful resources and discussion forums for those that fish The South End of Lake Michigan for Salmon, Steelhead, Perch, and Bass as well as elsewhere in the Region and Chicago area.