Zebra and quagga mussels (mussels) are aquatic nuisance species (ANS) that were first confirmed in Colorado in January 2008. At that time, the state implemented an aggressive education, watercraft inspection and decontamination program to prevent and contain the spread.
There have been no additional detections since the program began. In fact, almost all of the previously listed water bodies in CO have been de-listed to negative prevention status.
Colorado Parks and Wildlife, in coordination with various partners, continues their prevention efforts, alongside sampling and monitoring, for these harmful invasive species. The mussels have severe negative impacts on natural resources, fisheries, recreation, economics and water distribution infrastructure for municipal, industrial and agricultural supply.