Here is a site describing OHV trails in Oregon and other states too. You probably know of some but maybe not all. Click on any of the listings and there is a picture of the state and a star indicating what part of the state the trail is located. There are a few in southern (including the McGrew) and a bunch in central Oregon. I didn't look to see what was in northern Cal. 
Offroad Parks National Directory - ORV, ATV and 4x4 Vehicles
Offroad Parks National Directory - ORV, ATV and 4x4 Vehicles
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