The Greys River is a scenic waterway located in western Wyoming, originating in the Wyoming Range and flowing northward for approximately 60 miles before joining the Snake River near Alpine. This tributary of the Snake River drains a significant portion of the Bridger-Teton National Forest, with the Little Greys River serving as its primary tributary. The Greys River offers a range of paddling opportunities, from challenging whitewater to more relaxed scenic floats.

The river is divided into several distinct sections, each with its own character and difficulty level. The upper reaches, including the Little Greys to Highway Bridge section, feature continuous Class III-IV rapids over a 6-mile stretch, providing thrilling experiences for intermediate to advanced paddlers. The infamous Snaggletooth Rapid, a Class IV-V boulder-strewn gauntlet, is a highlight for expert kayakers. Downstream, the Middle Greys section from Little Greys to Squaw Creek offers a more moderate Class II experience over 4.5 miles, suitable for less experienced paddlers. The Lower Greys, running from Squaw Creek to Bridge Campground, presents Class II-III rapids with potential hazards like log jams and sweepers.

The Greys River is typically runnable from April through July, with some sections extending into October. Recommended flows range from 800 to 3500 cfs for most sections, with an average of 2000 cfs. The river's character changes dramatically with water levels, becoming increasingly challenging at higher flows.

The river corridor is known for its beautiful forested terrain and diverse wildlife, including elk, moose, and various fish species. Anglers frequent the river for its excellent trout fishing opportunities, with special regulations above Murphy Creek Bridge to protect the fishery.

Key access points include the Little Greys River confluence, Murphy Creek Bridge, and Bridge Campground near Alpine. The Greys River Road parallels much of the river, providing good scouting opportunities and multiple access points.

Safety considerations include the potential for rapid difficulty to increase significantly with water levels and the presence of natural hazards like log jams. Scouting is highly recommended, especially for the more challenging rapids like Snaggletooth.

For those seeking multi-day adventures, camping is available at various points along the river, including near Snaggletooth Rapid and at Bridge Campground. This allows paddlers to experience different sections of the river over consecutive days, combining challenging whitewater with more relaxed scenic floats through the beautiful Wyoming backcountry.