Map Description:
The Index of Watershed Indicators characterizes the condition and vulnerability of aquatic systems in each of
the watersheds in the United States. This involves an assessment of condition, vulnerability, and data
sufficiency. The approach is simple. First, indicators of the condition of the watershed are scored and assigned to one of
three categories: better water quality, water quality with less serious problems, and water quality with more
serious problems. Second, indicators of vulnerability are scored to create two characterizations of
vulnerability: high and low. The information provided by the Index of Watershed Indicators will help focus the attention of water quality
managers and decision makers on areas with problems in need of restoration, on areas with good water quality
in need of protection, and on areas where additional data is needed.
Cautions for this Product:
When looking at the results of the IWI,
however, it is important to note that the strength of monitoring programs varies across the country. Areas with
strong monitoring programs may show more problems than those with weaker programs. Good monitoring
provides valuable environmental information and should be rewarded.
For Further Information:
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