Nice grayling...was it in a little lake beginning with a W? I had the extreme pleasure of hook and line sampling the outlet creek when I worked for the park service there in 2000. We caught more rainbows than grayling but, what a place!!! Beauty fish! Pretty scary hiking out of that burn area in a windstorm with trees falling all around us.
Nice Grayling, I worked in the park for a couple of summers and hiked into those lakes a few times (bears are thick there). There are some nice rainbows in the particular lake you are fishing as well. The creek is wall to wall grayling in the spring when they are spawning, pretty neat to see. There are also some stretches of the river that flows out of this lake that have some good sized grayling up to around 12-13".