The upper Slate Gorge river run on the Provo River in Utah is a challenging Class IV-V section of water with steep drops, tight turns, and rocky rapids. Some of the key obstacles to navigate include Widowmaker, The S-Turn, and The Narrows. The best time of year to float this section is typically in the spring when water levels are higher, with recommended flows ranging from 400 to 750 cfs. This run is not recommended for beginners and requires experienced whitewater paddlers with strong skills and equipment. Overall, the upper Slate Gorge is a thrilling and technical river run for those seeking a serious challenge.