• Mississippi National River and Recreation Area

    Mississippi

    National River & Recreation Area Minnesota

Midden

A pile of mussel shells, also known as a midden.
A pile of mussel shells, also known as a midden.

Did You Know?

Headwaters of the Mississippi

The Mississippi River is approximately three feet deep at its headwaters at Lake Itasca and has an average surface speed of 1.2 miles per hour.