The discovery of quagga mussels in Lake Powell has prompted Arizona to shift from prevention to containment.
As a result, ramp hours will no longer be restricted and green mussel free certificates no longer required.
National Park Service staff plan to focus on checking for evidence of attached mussels on boats entering and leaving the lake. Rangers on the ramps, at the marinas, and along beaches will educate visitors on how to stop the spread of mussels with clean, drain, and dry techniques.
Arizona and Utah state laws require that boat owners decontaminate their vessels and conveyances to avoid the transport of quagga mussels to uninfested waters.
Quagga mussels can ruin boat motors and clog water intakes, such as pipes and screens on power and water-treatment plants.