I'll second the conditions that Atlantisboy described.
We fished it yesterday (Sun 21st). Water was surprisingly low and clear considering how much snow melt we've had around here in recent days. The water temp in the mainstem was 45 degrees. For a beautiful, warm sunny weekend day, there was surprisingly little fishing pressure, maybe 6 or 7 cars at The Run parking lot at noon. Several times during the day I could look hundreds of yards up and downstream and see no fishermen. Things did pick up and when we left at about 3:45 the number of fishermen had increased substantially and the lot was nearly full (I think a lot of the cars were dog walkers at Childrens' Lake). Anyway, we saw no surface feeding fish (and none below surface) despite a good number of midges around. I got a few fish: one on a streamer and the rest on small nymphs fished on light tippet. The fish were really laying low and I had to work hard for the few I caught. Nice day to be out. The local streams around here really look nice right now.