It will take days for major floodwaters to work their way south through the Mississippi. Flooding will persist through April.

But, how big is it, exactly? This animated map shows the scale of the Mississippi River and its drainage system in perspective. Follow Tech Insider: On Facebook More from Tech The Mississippi ...

American Rivers, a nonprofit environmental advocacy organization, named the Mississippi River the "most endangered river" of ...

The Mississippi River is considered the most endangered in the U.S. due to uncertainty over the Federal Emergency Management ...

American Rivers, a nonprofit environmental advocacy organization, named the Mississippi River the "most endangered ... like its flood maps that predict risks in different areas.