Stillwater River Professional Review and Guide
"Just as Greenland and Iceland share names with polar opposite descriptors, so does the Stillwater enjoy its ironic namesake. There is nothing still about the water that pours out of the east side of the Beartooth Mountains. The 65+ miles of the Stillwater are fast enough to make the upper Madison and its 50-mile riffle blush. In fact, whitewater enthusiasts are becoming quite a presence on the river, especially in the early summer in the faster sections above Nye. As for the fishing, the Stillwater is floatable in the early season from Nye down to Columbus, where it joins the Yellowstone. After early August only the final 14 miles below the Cliff Swallow access are navigable, and even then it becomes bony enough for only the most experienced oarsman.
Types of Fish: Rainbow, Brown, Cutthroat, and Brook Trout. This fly-fishing chapter describes the "where, when, and how" for fishing in this area. It includes a full-page map and information on the known hatches, suggested equipment to use, the best flies to use, season, limits, nearby accommodations, and camping."