Jeff, only grass shrimp I've sampled have been in flooded areas or swamps around big muddy R. and near Mississippi R. good idea about the plants drawing attention to your lake, that tall grass is everywhere around reclaimed strip mines. I bet a rattlesnake crossing sign or a sign proclaiming a rattlesnake protection area would deter a few people. Cattails alone will spread and make an effective barrier up here, not sure how fast with all that clay down there. That lack of fertility may play a roll in establishment of other species. I get down there about twice a year. Had last open water trip yesterday until march. I would like to get down in spring to do some prespawn fishing around the shawnee forest.
Robert B