The Clarks Fork Yellowstone River is a major tributary of the Yellowstone River, originating in the Beartooth Mountains of Montana and flowing southeast through Wyoming before joining the Yellowstone. This powerful mountain river carves its way through some of the most dramatic landscapes in the region, including the third deepest canyon in the lower 48 states. For whitewater enthusiasts, the Clarks Fork offers world-class paddling opportunities ranging from challenging Class IV day runs to epic multi-day Class V+ expeditions.

The river is divided into several distinct sections, each with its own character: The Upper Clarks Fork along the scenic Beartooth Highway in Montana features Class IV-V+ rapids through a stunning alpine setting. The Day Stretch near Cooke City, MT is a popular 4.2-mile Class IV-V run that can handle higher flows. The infamous Box Canyon section in Wyoming plunges through a 1,200-foot deep gorge, requiring expert skills to navigate its Class V+ rapids and arduous portages. Other notable sections include the Honeymoon (Class IV-V+) and Styx and Stones (Class IV-V). Given the river's intensity, most sections are suitable only for expert paddlers with solid Class IV-V skills and rescue training.

The paddling season typically runs from late spring through summer, with peak flows in June during snowmelt. The Clarks Fork's rugged canyon provides habitat for a variety of wildlife, including bighorn sheep, black bears, and golden eagles. The surrounding Shoshone National Forest offers spectacular scenery of towering cliffs and pristine wilderness. Key access points include areas near Cooke City, MT and along the Chief Joseph Scenic Byway in Wyoming. The town of Cody, WY serves as a base for many paddlers exploring the river.

Historically, the Clarks Fork Canyon was an important transportation corridor for Native American tribes. In recent decades, the river's wild character has been preserved through its designation as a Wild and Scenic River, protecting it from development.

Safety is paramount on the Clarks Fork. Paddlers must be prepared for remote wilderness, difficult portages, and potentially dangerous river features. Some sections require careful scouting and the ability to make critical decisions in challenging terrain. For those seeking the ultimate paddling adventure, multi-day trips through the Box Canyon offer an intense, committing experience in one of America's most spectacular river canyons. However, these trips demand extensive preparation, top-level skills, and a solid team.

The Clarks Fork Yellowstone stands as one of the premier destinations for expert whitewater kayakers in North America, offering a perfect blend of challenge, scenery, and wilderness immersion.