Madison River - Yellowstone National Park to Hebgen Lake Professional Review and Guide
"The Madison River originates at the junction of the Firehole and Gibbon rivers in the northwestern corner of Yellowstone Park. Its modest beginnings as a meandering meadow stream underscore the fact that its 130-mile path to the Three Forks of the Missouri is a marathon, not a sprint. The upper reaches of the Madison in the park are best fished spring, early summer, and fall as the high temperatures of midsummer are compounded by the multiple thermal features of the Firehole.
Types of Fish: Brown and Rainbow Trout, Whitefish. 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."