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  Duluth Stream Monitoring Data

We have changed the way these applets are launched.

 Here's why...

An applet is a program, written in the Java programming language, that was designed to be run in a web browser. The browser uses an extension called JRE (Java Runtime Environment) to run the applet. Because of security concerns, some browser makers (such as Chrome) have disabled the JRE extension, meaning those browsers will no longer run applets that are embedded in web pages.

So now we open these applets outside of the web page, using JavaWS (Java Web Start).

The applets are launched outside the browser, but they are unchanged, and they are still subject to the same sandbox restrictions as when they were run within the browser. The signed certificate that you are asked to accept when opening the applet confirms that these are the unchanged, original applets, written by us at NRRI.

When you click a link for a "jnlp" file, you will download a small app that is used to launch the applet. ("Jnlp" stands for Java Network Launching Protocol.)

Some browsers will let you launch the app directly when the link is clicked. And all browsers will let you save these files, which you can then open as you would any app on your computer -- even if your browser is closed!

Note: As before, you will need to have a JRE (Java Run-time Environment) installed on your computer. You should use the most recent version of the JRE to avoid security vulnerabilities discovered in older versions.

If you need to install a JRE you can do so at More information on installation and troubleshooting is available on their troubleshooting page.

Amity, Chester, Kingsbury, and Tischer Creeks

Beginning in 2002 we have been recording water quality data every 15 minutes from 4 different streams in Duluth:

Select from the following options to download a file that will launch an applet that will plot the data collected from all of those streams for the chosen year:

2002 2003 2004 2005 2006
2007 2008 2009 2010 2011
2012 2013 2014 2015 latest

This data should be considered provisional and subject to change.

The depth and flow readings are subject to errors when
the data is "collected under ice cover" -- more details here.


Select the sites you'd like to investigate and press the load data button.
After the data has been copied to your computer use the Plotter utility to examine the data.

Use the "List this Data" button to see notes & calibration comments for the plot.

Here are some tips for saving images.

Send questions or report any problems with the applet to


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date last updated: Wednesday February 08 2017