Another very easy & quick waterfall/rapids is Pissmire Falls located in the northern part of Menominee County, Wisconsin. For these you can basically drive up & park on the shoulder and view from the bridge across the Wolf River. Here’s the upstream view:
Downstream view shown here. Unfortunately I can’t access any further because this is on tribe land and I don’t want to trespass. Views from the bridge are nice enough!
Here’s a short video of the falls as viewed from the bridge. Enjoy!
Lat = 45.0851517 , Long = -88.6297913 -- Show at Google Maps