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Lake Itasca is no small spring.
ping
I’ve been there and was told the spring flowing out of the ground on the northern part of the lake, was the source of the Mississippi. (we walked across where it flowed into the lake.) Is it the only spring/source? I doubt it.
http://files.dnr.state.mn.us/destinations/state_parks/virtual_tours/itasca/vt_itasca360.html