The Star Canyon section of the Colorado River Segment 2 is a popular whitewater run for experienced kayakers and rafters. The ideal streamflow range for this section is between 1,000 and 3,500 cfs. The class rating for this section is a solid class IV, with some rapids reaching class V at higher flows. The segment is approximately 16 miles long and takes around 5-7 hours to complete.

There are several notable rapids and obstacles along the Star Canyon section, including the notorious Sledgehammer rapid, which is a technical class V rapid with a large rock in the middle of the channel. Other notable rapids include Satan's Cease, which is a long and technical class IV rapid, and Hell's Corner, which is a steep and powerful class IV drop.

Due to the technical nature of the Star Canyon section, there are several regulations in place to ensure safety and protect the environment. The use of kayaks and rafts is allowed, but motorized watercraft are prohibited. Additionally, all watercraft must be properly permitted and equipped with appropriate safety gear, including personal flotation devices (PFDs) and helmets.

In conclusion, the Star Canyon section of the Colorado River Segment 2 is a challenging and exciting whitewater run that requires skill and experience to navigate safely. With the ideal streamflow range, class IV-V rapids, and specific regulations in place, it is an excellent destination for experienced paddlers looking for a thrilling adventure in Colorado.