The Clark Fork River is a magnificent and diverse waterway that stretches over 300 miles, beginning near Warm Springs and Deer Lodge, Montana, and flowing northwest through Montana into Idaho where it empties into Lake Pend Oreille. This remarkable river system transforms dramatically along its journey, starting as a small, meadow-like stream in its headwaters before growing into Montana's largest river by the time it reaches Idaho. The Clark Fork has overcome significant environmental challenges from its mining history, particularly around Butte and Anaconda, where copper mining in the 1890s severely impacted water quality. Thanks to extensive cleanup efforts and conservation work, the river has made a remarkable recovery and now offers excellent trout fishing opportunities throughout much of its length. The river's size, character, and fish populations vary greatly from section to section, providing anglers with diverse fishing experiences from intimate small-stream fishing in the upper reaches to big-water tactics on the lower river.