The Dolores River - McPhee to Bedrock segment in the Uncompahgre Field Office of Colorado is a popular whitewater river run that spans 47 miles. The ideal streamflow range for this section is between 800-3000 cfs, with peak flows in May and June. The section is rated as Class II-IV and features several challenging rapids, including Snaggletooth, Stateline, and Pinball. The river also includes several narrow canyons that provide stunning scenery for rafters.

In terms of regulations, all boaters must obtain a permit to float the Dolores River, and commercial outfitters are required to have a permit from the Bureau of Land Management. Additionally, camping is only allowed in designated areas along the river, and all waste must be packed out.

Overall, the Dolores River - McPhee to Bedrock segment is a popular destination for whitewater enthusiasts seeking a challenging and scenic river run. With its unique rapids and stunning natural beauty, it is a must-visit for anyone looking to experience the best of Colorado's whitewater rafting.