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Originally Posted by tsofian
The issue with things so close to the Great Lakes or rivers is that the water table is generally pretty close to the surface. In addition rivers and lakes can rise and the surface water can also change locations. Shorelines changes and rivers meander.
The reason that there can't be a base in Missouri is the water table is really high, even in the Ozarks. I'd love to put a base in an old lead mine but they flood in just a few years if they aren't constantly being pumped.
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Just remember, the geology around Detroit is quite diverse. There is a very dry salt mine at a depth of 1200 feet below the surface that is still in operation to provide salt for deicing roadways. There are hundreds of miles of road in the mine that cover an area greater than 1500 acres. This salt mine in within a few miles of Zug Island.
The deposited material from the retreating glaciers is not very thick around Detroit. Bedrock is found pretty close to the surface and there is plenty of clay, making a very good aquitard.