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Bloomington History Timeline

Glaciers Shaped the Minnesota River Valley

Lake Agassiz, the largest of the inland seas, once sprawled across North Dakota, Minnesota, Manitoba and parts of Ontario and Saskatchewan. Overflowing waters from the lake poured south through the glacial River Warren to carve the prominent bluffs and landscape of the Minnesota River Valley. The River Warren was formed when the melting waters caused Lake Agassiz to overflow its banks, rapidly forming the River Warren.

Drawing of the huge lake that covered most of northern Minnesota.
Lake Agassiz

Picture this!

The River Warren carried one walloping amount of water in its day, as much as the Mississippi River in full flood. The River Warren was the depth of the present valley floor at Fort Snelling State Park and as high as the Mendota Bridge, stretching from the bluffs of Bloomington to the bluff of Burnsville.


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