Heading east along the Indian Boundary Line. I don't know that the boundary was a significant place in the lives of the Native people who lived here, although the treaty process that caused it to be surveyed certainly was. For the American settlers, it meant that land on the north (left) side of the line was not available for purchase until a very few years after the land on the south (right) side of the line was put up for sale.
Here the Indian Boundary Line, so called, follows an overpass over I-39. Someday I may have a chance to follow the line all the way to the Fox River. (There are not visible traces of it along the entire distance, but there are some.) But I was close to our motel in Mendota, so this was a good place to turn around and head there.