Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The thickness of the Mississippi River Valley alluvial aquifer ranges from about 25 to more than 150 feet. The aquifer is more than 75 feet thick in most locations.
Public Domain.
