October 10, 2019:
I received an email over the weekend about a berm blocking the access road to Trigo Canyon. I was able to get out there today and found the same berm (see pictures below). Ironically, just as I was driving on to the Trigo road, a couple was driving out. They too were blocked and frustrated by the berm.
I called the Mountainair Ranger District. They told me that they have been made aware of the situation and intend to fix the road as soon as they clear some roads for firewood gatherers.
My guess is that, one could drive over the berm with a high clearance vehicle once the road dries out. But it will be so much better when the Forest Service fixes the road.
The good news is that Trigo Canyon will remain open to the public.