Cool, thanks for the link.
Poudre rock report is the best resource for tracking levels in the canyon:
Poudre Rock Report
Big South gauge rock buried means it's pretty high. I think 1 3/4" on the rock is about as low as I've done it and you probably don't want to run it much lower than that.
As for predicting Long Draw releases, I don't think they advertise anything, but you can probably guess that if it's hot and dry in the plains they're likely to release more. deepsouthpaddler on this forum probably has the best connection to find out some insider information on Long Draw releases before a given weekend.