We have had a few questions recently regarding whether or not it is legal to ride an electric mountain bike on Forest Service trails.
We didn’t know, so we asked the Flagstaff Ranger District. They provided these two documents.
In summary, e-bikes are treated as motor vehicles and are subject to all of the same laws and regulations as motor vehicles on Federal lands.
Check these links for details:
US Forest Service E-Bike Policy
Bureau of Land Management E-Bike Policy