The Whitewater River Run located in Colorado River Segment 3A in the state of Utah is a popular destination for whitewater enthusiasts. The ideal streamflow range for this segment is between 1,000 and 7,000 cubic feet per second (cfs). This segment has a class rating of III to IV, making it challenging for intermediate to advanced paddlers. The segment is 9.5 miles long and features several exciting rapids such as Skull Rapid, Little Niagra, and Satan's Gut. These rapids are known for their steep drops, technical lines, and large waves. There are also several eddies and boulder gardens along the way that pose additional challenges for paddlers.

To ensure the safety of all visitors, there are specific regulations in place for this area. All boats must have a Type III or V personal flotation device (PFD) for each person on board. Additionally, all boats must have a whistle and a throw rope. Boats must also be equipped with a permit, which can be obtained through the Bureau of Land Management. There are also specific regulations in place to protect the environment, including restrictions on camping and fires along the riverbank.

In conclusion, the Whitewater River Run in Colorado River Segment 3A is a challenging and exciting destination for whitewater enthusiasts. With its ideal streamflow range, class rating, specific river rapids/obstacles, and regulations, this segment offers a thrilling experience for those seeking adventure on the water.