Rainbow Falls is the lowermost of the Black River Falls, a wild chain of drops before the river enters Lake Superior. This waterfall is one of the taller ones, dropping over a slide of conglomerate that ends in a sudden plunge in a deep pit, creating a deep roar of foamy water. There is a viewing platform at the crest although the views are limited.
Head north from US-2 out of Bessemer onto Black River Road via N Moore Road. This route is also known as County Road 513 and should be well marked. Continue on Black River Road for 15 miles and park at the parking area. This is the last riverside parking area south of the harbor, if you'd rather visit the mouth of the river first. Follow the trail and wooden stairs down to the waterfall.