From the benchWith water temps at 55°F and sunny skies pushing the high to 73°F, the best dry-fly window will open between 11 AM and 2 PM when BWOs start trickling off the slower tailouts. Before that, work a tungsten nymph like the Frenchie or Straggle Stone tight to the bottom in 3-5 ft of water through the heads of pools — set your indicator so the fly is ticking the substrate. Once the afternoon heat builds, shift your focus to the grassy, brushy banks with a Bionic Ant or Hopper, casting within 6 inches of the bank and letting it sit. Rock Creek's browns are in pre-spawn mode and will be aggressive, so don't rush your presentation — let the fly work the full drift before picking up.