About the Study Guide

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

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  • 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.