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The Blackwater Canyon is a popular whitewater river run located in Utah. The ideal streamflow range for this area is between 500-1,000 cubic feet per second (cfs). The run is rated as a class III-IV, which makes it suitable for intermediate to advanced paddlers. The segment mileage of this river is approximately 8 miles long, starting from the upper canyon and ending at the confluence of the North Fork.

The Blackwater Canyon offers a variety of rapids and obstacles, including the 'Cheat Canyon', which is a notorious rapid that is rated as a class V. Other notable rapids include 'Tunnel Rapid', 'Big Nasty', and 'Coliseum'.

It is important to note that there are specific regulations to this area, and all paddlers must abide by them. The use of personal flotation devices is mandatory, and all paddlers must be skilled in whitewater rescue techniques. Additionally, there are specific access points where paddlers are allowed to put in and take out, and all vehicles must have a permit to park in the designated areas.

In conclusion, the Blackwater Canyon is an exciting whitewater river run that offers a challenging experience for intermediate to advanced paddlers. The ideal streamflow range is between 500-1,000 cfs, and the run is rated as a class III-IV. With a variety of rapids and obstacles, it is important for paddlers to be skilled in whitewater rescue techniques and to abide by the specific regulations in the area.