Invasive mussels imperil western water system

Two years after an invasive mussel was first discovered at Lake Mead, the population has firmly established itself and gone on a breeding binge, with numbers soaring into the trillions.

Despite efforts to stop their spread, scientists say it's only a matter of time before quagga mussels appear throughout the West's vast system of reservoirs and aqueducts, raising operation and maintenance costs by untold millions.

Water agencies and wildlife managers in California, Arizona, Nevada and Utah have put in place aggressive measures to try to prevent their spread, including mandatory decontamination or quarantine of boats traveling from infested areas or chlorinating some water inlets to try to kill off the mussels.

But as their counterparts in the northeast and Great Lakes region have found, eradicating the mussels is virtually impossible. The thumb-sized mollusks attach to almost anything and can clog drains and pipes, freeze up cooling systems, kill off native species and render power boats inoperable.

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