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In this July 6, 2009 file photo, Andrew Munoz, of the Lake Mead National Recreation Area, holds up a rock covered with the invasive quagga mussels at Lake Mead National Recreation Area, Nev. A regional power planning group from Idaho, Oregon, Washington and Montana is pursuing $2 million from the federal government to help fend off the menace of invasive mussels that have clogged Colorado River reservoirs since 2007. These states and others say they’re frustrated by the number of boats that continue to come from Lake Mead in Nevada and Arizona over their borders infested with quagga and zebra mussels.

AP / Felicia Fonseca