We are pretty lucky (so far) on Burl Ln, since we are not on a steep incline. We've just been here a year, and we have not had any of our backyard slide. Our fence seems fine right now, too. How long has yours been up?
P.S. I did see Southwest Erosion Control driving through the neighborhood a few days ago. I don't know if that was just to appraise the work needed to keep erosion out of the streets, though.