This data is provided by the USGS, which is monitoring the water quality on Lake Mead.
Visit their website for further information.

An alternative is to download and open this file: WOW_LakeMead__dataVisualizationTools.jnlp, which will launch the original Java version of the WOW Data Visualization Tools, but it will run outside of your browser.

Many institutions no longer support using the Java plugin that the above approach relies on. Because of this, we are rewriting the data visualization utilities, using JavaScript, so the data can be plotted without the need for additional plugins.

The rewrite is still in progress, but click here to try it out.

The data should be considered provisional and subject to change.

Send questions or report any problems with the applet to wow@nrri.umn.edu