ST. PAUL (AP) - Minnesota has launched a revamped website on snow conditions to coincide with the opening of the state's 22,000 miles of snowmobile trails.

The state Department of Natural Resources announced Monday the trails are officially open, although many don't have enough snow for riding.

The Minnesota United Snowmobilers Association president says there are more than 216,000 snowmobiles registered in the state. Local snowmobile clubs in the association maintain most of the state's trails, while Minnesota owns and maintains around 600 miles.

The DNR is reminding residents to register snowmobiles and inspect equipment ahead of more snowfall.

DNR conservation officer Adam Block says riders should know the rules, drive sober and be especially careful around waterways where ice may not be very thick so early in the season.