This is the sort of thing you'll probably want to bookmark for later use - especially since winter is knocking on the door.  St. Louis County has introduced improvements to their online map portal which now allow ATV users the ability to know where they can legally drive on roads and trails.

The county map site has been around for a few years, but these recent improvements add to the usability of the site.  By highlighting the "recreation  theme", users can easily see where they can use their ATV's on county roads, state trails, Forest Service roads and trails, and more.

Two additional options are available:  one is a mobile app version of the County Land Explorer which allows the resources to be used "on-the-go".  There is also a PDF version of the map which can be viewed and downloaded by clicking here.