The North Tongue River, a rugged mountain stream in northeastern Wyoming, originates high in the Bighorn Mountains near Horse Creek Ridge. This swift-flowing waterway carves its way northward through the dramatic Tongue River Canyon before joining the main stem of the Tongue River northwest of Dayton, Wyoming. The river's most notable paddling section runs from Sheep Creek to the Tongue Canyon Trailhead, a challenging 2.34-mile stretch that demands expert-level whitewater skills. This segment, rated Class IV-V+, features powerful rapids and swift currents as the river drops significantly in elevation through the canyon's confines. Suitable only for advanced paddlers, the North Tongue River offers a short but intense whitewater experience.

The river's difficulty stems from its steep gradient, technical boulder gardens, and the potential for wood hazards. Paddlers must possess solid river-reading abilities and self-rescue skills. Spring runoff, typically peaking in late May to early June, provides the most reliable flows for paddling. However, the narrow window of optimal conditions and the river's difficulty limit its popularity to a small group of skilled enthusiasts.

The canyon's ecosystem supports a variety of wildlife, including mule deer, elk, and numerous bird species. Ponderosa pines and Douglas firs cling to the canyon walls, creating a scenic backdrop for the tumultuous waters below. Key landmarks include the distinctive Needle's Eye formation within the canyon. The Tongue River Canyon Trail, popular among hikers and anglers, parallels the river, offering spectacular views of the whitewater below.

Access to the put-in at Sheep Creek requires a rugged drive or hike, while the take-out at Tongue Canyon Trailhead is more readily accessible from Tongue River Road. Dayton, Wyoming, serves as the nearest town, providing basic services for paddlers.

Historically, the North Tongue River and its canyon have been important to the region's Native American tribes and early settlers. Today, it remains a vital water source for local agriculture and a prized destination for outdoor enthusiasts.

Safety is paramount on the North Tongue. Paddlers must scout rapids thoroughly, be prepared for cold water, and respect private property along the river's course. The Bighorn National Forest manages much of the surrounding land, and paddlers should be aware of any specific regulations or fire restrictions. While multi-day trips are not typical on this short, intense section, the river offers a thrilling day adventure for those with the skills to navigate its challenging waters.