The Coal Wash run on the Whitewater River in Utah is a Class III-IV rapid run with a specific streamflow range of 200-600 cfs. The ideal flow is around 300 cfs, creating a thrilling yet manageable run. This 9-mile segment of the river starts at the Coal Wash put-in and ends at the Lower Whitewater Campground.

The Coal Wash section of the Whitewater River has numerous rapids and obstacles that require technical skill and experience. Rapids such as "Twisted Sister," "Scream Machine," and "Bob's Leg" feature technical maneuvers, tight turns, and large drops. Boulders and rocks also dot the river, adding to the challenge.

In addition to the technical nature of the run, the area has specific regulations to ensure safety and conservation. The Bureau of Land Management (BLM) oversees the Coal Wash section and requires all boaters to have a permit and follow Leave No Trace principles. The BLM also enforces a limit of 15 people per group and requires all groups to have a designated trip leader.

Overall, the Coal Wash section of the Whitewater River in Utah provides an exhilarating rafting experience for experienced paddlers. However, it is essential to check the streamflow and adhere to the BLM regulations to ensure a safe and enjoyable trip.