Steel plating could be temporarily fastened over the giant pothole in the spillway. It would at least mitigate erosion.
Flick. I came across your post while googling the idea of installing temporary steel plating supported by I-Beams across the chasm in the damaged Oroville Dam spillway. I noticed that no one responded publicly to your post, just wondering if anyone contacted you privately through the free republic network ? I was looking at some recent HD pictures of the damage and personally I don’t think it would be very difficult to construct a steel patch over the damage and if done, the worst case is that it would fail next time they move huge volumes of water down the spillway. Back in 1970 a group of Engineers figured out how to save the lives of the crew on the Apollo 13 mission using a “temporary” band-aid solution so I ask, why can’t the Engineers figure out a temporary band-aid solution that could get them through to the dry months without causing more erosional damage ? Time is running out but with enough welders I think it’s doable. They could even overlap the 1/4” thick sheets of plate steel on top and bolt them together which would take very little time. It doesn’t have to be pretty.