You may try this web site for Southwestern Power Association which gives the schedule for water generation from Tablerock. A few hours later depending on how much they generate they usually run at Powersite. Mr. Lilley or someone may give you advice on how that works or search that topic on here there for past posts. I have used it to fish walleye in Jan. and Feb. and it helps some then on water moving below powersite. Not a sure thing but another tool to use if its a long drive.
http://www.swpa.gov/generationschedules.aspx