Natural resource professionals attending the Regional Technical Workshops were asked to give each threat a severity rank (high, medium, low, none, unknown) for their ecoregions or lake basins of expertise. These ranks were given numerical values and averaged to develop a mean severity value for each threat within each ecoregion and lake basin (Appendix E).

Those threats with the greatest severity are also listed in the Lake Basin/Ecoregion Overviews: