Black Maple problems
Is there something affecting Black Maple trees. Note the photos below. Anthracnose and Iron Chlorsis was mentioned to the homeowner a possibilities.
Blue Earth County Minnesota maple trees
This doesn't look like anthracnose to me:
This tree is looking very bad. How long has this been going on? There may be a number of reasons but usually the signs and symptoms come on gradually.
Girdling roots is a possibility. I can see that the tree is sitting in the ground like a telephone pole. It should be raised up from the lawn and roots should be visible:
Verticillium wilt is a possibility but usually that starts with leaf and limb death on one side:
Here is a list of the usual problems that afflict maple trees. Perhaps you can find some additional symptoms that will make a diagnosis better: