Fees have gone up, in some cases dramatically, for violations on Colorado’s national forest land.

The fine for using a motorized vehicle, such as a snowmobile or a dirt bike, in a designated wilderness area is now $500, up from $75. The fine for being off of a designated road is now $250, up from $75, and the fine for an unregistered snowmobile went up from $50 to $100. All fines also require a $25 processing fee.

The upped fines went into effect on Friday.

Tim Lamb, a district ranger for the White River National Forest, which surrounds much of the Roaring Fork Valley and includes other ski areas in Eagle and Summit counties, said the Forest Service revisits its violation fines every 10 to 15 years, and that Colorado had not raised its fines in at least 10 years. Fines are set on a state-by-state basis, and Colorado’s fines are lower than some neighboring states, Lamb said.

With an increase in the sales of snowmobiles and ATVs in Colorado over the last decade, it is no surprise the Forest Service is cracking down on illegal off-road vehicle use, Lamb said.

With a “minimal” fine of $75, some backcountry users might not have thought twice about entering a wilderness area on their vehicle, Lamb said.

“If it’s $500, that person might think two or three times,” Lamb said.