Ok, the wall was partially knocked down by a snowslide. The "rocks" (boulders, actually) are strewn all over the downslope. Even if they locate the ones that were part of the wall, no one with the has the skill to put them back exactly as they were. So option one is a concrete wall in the hole, option two is bypass the wall entirely using the wagon road as access which would limit Alpine to 4-WD only. I suppose they could put in a temporary bridge to be removed every Fall. Not likely. There you go.
JP