About the Study Guide

You are looking at a preview of what’s in the Montana Offroad Ed Course. Feel free to look around, but you’ll need to register to begin progress toward getting your OHV Safety Education Certificate.

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Ordinary high water mark
  • The Ordinary High Water Mark (OHWM) is a stain on rocks and trees along the shoreline of a waterway, defining where the highest water level usually is.
  • Areas below the OHWM, such as exposed shorelines and lake beds, are very important to ecosystems.
  • Because vehicles can easily damage these vulnerable areas, you should never operate below the OHWM.