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Your reservoir being 50 plus feet low could be no big deal or it could be a big deal depending on if you drainage basin winter snow has melted yet or not.

It's my understanding that there wasn't much snow to melt in the first place and that a warmer than usual spring has melted it all already. I asked a local in the Glen Canyon area how low they would allow Lake Powell to drop before they stopped letting water out and he said there was no limit. As long as electricity was needed and they could turn a good profit on generating it, they would let the water out.

Lake Powell is a very deep lake with some channels as deep as 500 ft.so I guess letting it drop more wouldn't harm the eco-system. My guess is they're making a ton of $$$ selling to CA.

Your explanation should solid. The only caution, is that east of the Rockies, the weather has been and continues to be very dry. I have hear a number of statements about very significan drought and near "dust bowl" conditions. I don't see that being a problem in your case, but in some western states hydro could be in short supply depending on the drainage basin.