Worst Invasive Species Areas Ranked in Western States

Non-indigenous Aquatic Species (NAS) threaten our lakes, rivers, streams and oceans. Often introduced by unknowing recreational users, these harmful invasives can drastically alter aquatic ecosystems, foul equipment, and negatively impact native species. Invasive species are slowing spreading throughout the United States, Wildlife Forever and partners with the Bureau of Land Management (BLM) and United States Geological Survey (USGS) decided to take a look at the current and potential future impact of NAS in the West.

Invasive Species Infestations by Congressional District. Congressional Districts west of the 100th meridian ranked by Infestation Score. The higher the score, represented by a dark red color, the more infested the area is by Nonindigenous Aquatic Species.