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Lake Huron has extremely flat shores. There are places where you can walk a long way out, and still be up to your waist. Thus, a small change in water level has massive effects on the shoreline. Lately its been very bad.
When your boat now has to be anchored a mile away, people look to someone to blame. They claim that the US army dredged the St. Clair River in the 60's, yada, yada. Now, Lakes Erie and Ontario have increased their levels.
Part of this can be explained by long-term rain levels, but a part is the good old ice age.
You can see here that the winner lakes have their outlets more to the north than their inlets. That results in a water rise. On the other hand, Lake Huron is tipping its water out. It's a small effect, but in a shallow basin, things magnify.
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Effects of buoyancy on the mantle and lithosphere. You can liken the effects of this to dumping someone off an inner-tube into the river rapids and then laughing and pointing your finger him. The inner-tube will also experience isostatic uplift and might even throw you off too. But instead of rubber you got rock and instead of freezing icy water (never doing that again, EVER!) you got molten nearly-white-hot magma.
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