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The Cottonwood Creek Segment 28-29 is a popular whitewater river run located in the state of Utah. The ideal streamflow range for this segment is between 300-600 cfs. The class rating for this run is Class IV-V, making it a challenging and exhilarating experience for experienced paddlers. The segment mileage is approximately 4.5 miles long, starting at the Cottonwood Creek Bridge and ending at the confluence with the Colorado River.

The Cottonwood Creek Segment is known for its technical rapids, steep drops, and boulder gardens. This particular stretch of the river features several challenging class V rapids such as "The Squeeze" and "The Meatgrinder". Paddlers should be aware of other potential hazards such as strainers, undercut rocks, and strong currents.

In terms of regulations, paddlers must obtain a permit to run this section of the river. The permit can be obtained through the Bureau of Land Management and is required between March 1st and June 30th. The permit system helps to limit the amount of traffic on the river and ensure that everyone adheres to safety protocols.

Overall, the Cottonwood Creek Segment 28-29 is a thrilling and challenging whitewater river run for experienced paddlers. It is important for paddlers to be aware of the ideal streamflow range, class rating, specific rapids and obstacles, and regulations in order to ensure a safe and enjoyable experience on the water.