The entire Great Lakes region is currently undergoing isostatic rebound:
TL,DR: During the most recent ice age, the massive weight of glaciers in this region pressed the crust downward into the mantle. Now that the glaciers are gone, the area is slowly rebounding to something more like the usual curvature of the earth.
Lake Superior isn’t quite as thick or broad as those glaciers were, but surely the weight of all that water is helping to push the crust down at least a little bit.
Once you remove it, you would expect that the area might see a little bit of extra isostatic rebound in the coming decades and centuries.
Now I am picturing giant sweet water mermaids playing mikado.
[modern CGI studio] Challenge accepted.
Yes…but remember that this was in the 1950’s.
It was Stan Freberg’s radio promotion, and here it is
OK, we’ll show them a clip of Lucy Ball working the candy line, or stomping grapes, or simply getting stuck in a chair when she was hugely pregnant, and saying “OK, do this on radio - and have it as funny.”
Sadly I think you are correct. I should pay more attention to the horizontal scale on my image. Off Copper Harbor it drops down 1000 feet or so in 20 miles, 50 feet per mile average. It is much steeper towards the bottom but still is only about 125 feet per mile.
