• Mississippi National River and Recreation Area

    Mississippi

    National River & Recreation Area Minnesota

Calipers

Using calipers to measure mussles.
Measuring mussels with a caliper.

Did You Know?

Lock and Dam Number 1 from a long distance.

At Lake Itasca, the elevation of the Mississippi River is 1,475 feet above sea level. It drops to sea level at the Gulf of Mexico. More than half of that drop occurs within the state of Minnesota.