Depends entirely on the weather and generation levels. You can check them here http://www.swpa.gov/generationschedules.aspx and get a VAGUE idea of what they are doing. Subject to change without notice. Usually right after you've hooked the first fish of the day. Or while your are rigging up...Or right as you get out of your vehicle and start to put your waders on...Well, you get the point!
"They say you forget your troubles on a trout stream, but that's not quite it. What happens is that you begin to see where your troubles fit into the grand scheme of things, and suddenly they're just not such a big deal anymore." - John Gierach