A very effective ploy which is often great now is to present the Murray's Flying Beetle #16, Mr. Rapidan Ant #18 or Murray's Housefly #16 with a splat. This often attracts the trout just like a natural insect falling onto the stream from the tree limbs above. Fish all of these on a 6X or 7X tapered leader.
The trout are starting to move up the streams to get to cooler water temperatures. The streams are low and clear so watch your approach and sneak, sneak, sneak. Also be sure to not fish behind someone on these small streams because what they didn't catch they already spooked.
You can either come in of the Skyline Drive or access these streams from the boundary access. For more information on these streams, see my book Trout Fishing in the Shenandoah National Park.