Originally Posted By: TrappDyke
...I'm pretty sure continual clearing of the rocks is just going to make it worse....

Absolutely TD.
Continually removing the stones and rocks will just allow the runoff to more quickly erode the exit trail. You'll notice in the posted photos above the depth of that exit trail as it appears to becoming more of a trough or shallow gully.

Not only will a common water bar divert runoff, it may possibly catch stones and rocks well above the cliff edge.