KevinR wrote:
IIRC, Bob R. once posted the angle, and I believe it was 35%.

Just for fun, I used this map and did some calculations:


Using a Meters to feet calculator, a GPS distance calculator, and a Right triangle calculator, I got these numbers, using the distance between the 3860 m and 4160 m contours:

 metric   
contour   feet  gps locations
 3860    12664  36.561545,-118.287505
 4160    13648  36.558788,-118.289887
   
vertical:     984 feet
horizontal:  1223 feet
slope angle:   38 degrees
slope:         80%  (vertical / horizontal)


According to Wikipedia, the angle of repose of dry sand is 34 degrees. So these measurements correspond pretty well to that slope consisting of talus.

So the 38 degree slope is doggone steep! Nice to see that it is fairly close to Bob R's measurements.