The biggest town near there is Houghton. Here's another page on the dredge that has a Google Map on it:
Also, across the road from where the dredge is there are a few abandoned buildings that are really cool. One is right on the road, and the others are just behind it off into the woods.
I should also mention for anyone taking two-wheeled transportation, the last 11 miles of Hwy 41 going into Copper Harbor is the most fun I've ever had on a motorcycle.