In Wisconsin, on highway 151, southwest of Madison

Question

When traveling north on 151 southwest of Madison, there is a very large white "M" carved on the side of a rock formation on the north side of the highway. I have always assumed it was some type of aircraft marker, but when an out-state friend asked for info, I realized I don't really know. Can anyone provide the "what & why" of this landmark?

Answer 1

I'm not certain .....but I believe it has something to do with mining.

That whole area was a lead mining region.

You could probably get an indepth answer from the University of

Wisconsin Platteville.

I'm a truck driver and have been thru the area numerous times.

thats best answer I have gotten from the Locals there