As more riders are discovering the thrills of zooming up and down hills in Lyon County and across Nevada, the number of dirt bikes and all-terrain vehicles is increasingly at odds with those who see a threat to nature.

The number of dirt bikes and all-terrain vehicles nearly tripled across the country since 1993, a phenomenon critics and land managers said comes at increasing cost to a vulnerable landscape.

Lyon County's hillsides are the perfect terrain for most ATV riders, but ragged tread scars criss-cross the hills, meadows are torn up by spinning tires and conflicts are increasing between those who enjoy motorized recreation and others who see it as a threat.

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