Made it back from my trip to SD & CO and I must say that the stopover in Custer State Park was fantastic. Not only great scenery, tons of wildlife viewing ops & movie film scenes (i.e. National Treasure - Book of Secrets) - but the fly fishing was also fantastic! I only had 1/2 day to sample Grace Cooliage Creek ... but in just 3 hours I caught over 40 fish, most of which were brookies. The stream sits at about 5000' but at first glance the small creek, dark in color with a small granular rock bottom would lead one to believe that a thriving population of brook trout would not exist there. But indeed they do - so if you are traveling out to Yellowstone via Missouri/Iowa on I-90 I highly suggest you consider stopping over in Custer State Park and stay @ Sylvan Lake Lodge or The State Game Lodge and try your luck! I would post some fish pics - but I am not sure how to do this on the blog.