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Quagga mussels cling to the bottom of this boat at Lake Mead. Federal authorities said they have removed 150 of the invasive musse This is the average size of a quagga mussel at Lake Mead. Because 14 of the destructive mussels were found recently at Lake Powell File | Natalie Muth, Utah Division of Wildlife Resources The prop on this boat motor at Lake Mead is covered with quagga mussels