Grand Portage State Park, MN As predicted, High Falls opened up big time over the weekend! The waterfall is now officially fully open! I walked up to the falls after work yesterday and there was a ton of water pouring over the ledge. At a drop of 120 feet, this is Minnesota's tallest waterfall. The water was coming down with such force that the spray was shooting up beyond the top of the falls! It's an amazing sight to see. Come on up and check it out for yourself.