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.
Data collection will be discontinued Oct. 1, 2025, due to loss of funding. Please contact the Central Midwest Water Science Center, Gary Johnson (gjohnson@usgs.gov) if you have an interest in continuance and/or support of data collection activities at this site.
