The upper Greys River, from Murphy Creek Bridge to Lynx Creek Campground, is a 9-mile river run with Class II-III rapids, making it suitable for intermediate-level kayakers and rafters. The best time to float this section is during spring runoff or early summer when the water levels are high, with recommended flow rates between 500-1000 cfs. The river features boulder gardens, tight channels, and small drops, providing an exciting run. Be aware of log jams and strainers, especially during high water, and scout the rapids beforehand. Overall, this is a fun and scenic river run that requires some experience and caution.