A few things to know before you go to Raging Rivers Dominic Genetti, dominic.genetti@hearst.com FacebookTwitterEmail Raging Rivers, the popular waterpark in Grafton, is set to open this Memorial Day Weekend. It's a sure sign that everyday life is making its way back to a sense of normalcy before the COVID-19 pandemic. To ensure you are caught up before heading out to the longtime attraction, we chatted with General Manager Ken Handler. Here’s a few things to know before you go to Raging Rivers. Current state guidelines • Social distancing as best as possible is encouraged. • The park will be operating between 60 and 70 percent capacity.