Utah's already infested by mussels and they're on the spread.
http://wildlife.utah.gov/news/08-11/zebra_electric.php
A small, high-mountain lake in central Utah is the first body of water in Utah to test positive for zebra mussels. The Division of Wildlife Resources announced Nov. 18 that zebra mussel DNA has been found in water samples taken from Electric Lake.
Electric Lake is in Emery County. The lake is the headwater of the Huntington River. It's also the water source for Rocky Mountain Power's Huntington electric generation plant and the primary source of water for the Huntington-Cleveland Irrigation Company.
"These mussels will harm the lake's fishery" says Larry Dalton, aquatic invasive species coordinator for the DWR. "They also have the potential to damage the electric generation plant and the irrigation systems by plugging up their pipes."
http://wildlife.utah.gov/news/08-10/quagga_update.php
The DWR has received conflicting results from samples taken at Red Fleet Reservoir in northeastern Utah, Electric Lake in southeastern Utah and the stretch of the Colorado River near Moab.
Work done under a microscope at one laboratory, and DNA test results from a second lab, indicated the samples contained veligers. But DNA results from a third lab said the samples did not contain veligers.
At two additional waters in northeastern Utah, Pelican Lake and Midview Reservoir, work done under a microscope at one lab indicated that both waters had veligers. But DNA tests at both the second and third labs indicated the waters did not have veligers in them.
Additional DNA testing is taking place at both waters. In the meantime, Midview Reservoir, which is on Ute tribal land, was closed to boating by the Ute tribe. For more information about boating and fishing at Midview and Bottle Hollow reservoirs, call (435) 722-5511.
"Lake Powell is another water we're concerned about," Dalton says. "It's a popular boating water and receives boaters from all across the West. Many of those boaters arrive from nearby waters, such as Lake Pleasant, Lake Havasu and Lake Mead. All three of these waters have quagga mussels in them."
Quagga and zebra mussels were not found in Lake Powell this summer, but conflicting microscope and DNA test results did occur in 2007.
Because the lake faces so many threats from mussels, DWR and National Park Service personnel at the Glen Canyon National Recreation Area will ramp up their already intense efforts to manage boaters and the mussel threat.
"Now that quagga and zebra mussels have been confirmed in the Colorado River's headwaters, and quagga mussels might be in the Colorado River near Moab, the threat to Lake Powell has increased again."