Reclamation Information Sharing Environment (RISE)

The patterns of surface elevation changes were compared between waterbodies with and without infestations of quagga mussels. The frequency of drawdowns was higher in waterbodies with infestations, while the duration of drawdowns and absolute change in elevation were greater in waterbodies without infestations. Patterns from suspect waterbodies, where mussels have been observed but the population appears to have failed, were more comparable to negative waterbodies than to positive waterbodies. This suggests that patterns of water management in reservoirs may have implications for the potential that quagga mussels may become established.