Hopefully dropping the lake right now wont hurt the spawn too terrible. I I know fish are shallow but I have not heard of fish being caught on bed yet. But I think it will be within the week before you catch fish actually on bed. But I may be wrong.
I think, or I hope, the core learned its lesson two years ago when the lake stayed 7-8ft below summer pool all summer long. I beleive That spawn was bad as well. It stayed low alot longer than normal, and had a drastic 15ft rise and stopped, then they could never make summer pool. I caught several fish at the top end of skaggs that were full of eggs in late May. I question if those eggs were ever succesfull. I say not.