within or along the borders of the state, has its principal sources in and near Lake Itasca.
The state supports three parks - Itasca state park (22,000 acres, established in 1891), about the sources of the Mississippi, in Clearwater, Becker and Hubbard counties; the St Croix (established in 1895), in Chicago county, across the St Croix from the Wisconsin state park of the same name, and including the beautiful Dalles of the St Croix; and the Minneopa state park (established in 1905), containing Minneopa Falls, near Mankato.
Further search for the true source of the Mississippi was made in 1823 by Giacomo Constantio Beltrami (1779-1855), an Italian traveller and political refugee, and in 1832 by Henry Rowe Schoolcraft, who had accompanied Cass's expedition and traced the Mississippi from Lake Cass to Lake Itasca.
Schoolcraft, Narrative of an Expedition through the Upper Mississippi to Itasca Lake ...
Its sources are in the morainic lakes in northern Minnesota; Lake Itasca being only one of many glacial lakes which supply the headwater branches of the great river.