Charlton Creek is a class IV-V river run located in the state of California with a segment mileage of 6.8 miles. The ideal streamflow range for this river run is between 300-1000 cfs. The run starts at Charlton Peak and ends at the South Fork of the Santa Ana River, and is known for its steep gradient, narrow channels, and technical rapids.

The most challenging section of the river is the three-mile stretch from Charlton Peak to the confluence with Plunge Creek. This section is characterized by steep drops, tight turns, and boulder gardens. The most notable rapids on this section are the Charlton Falls, a 20-foot waterfall, and the Plunge Creek Falls, a 60-foot waterfall.

There are specific regulations to the area, and permits are required to run this river. The permits are issued by the US Forest Service, and only a limited number of permits are available each year. Additionally, there are restrictions on camping, fires, and group size.

In conclusion, Charlton Creek is a challenging and technical river run that requires experience and skill. The ideal streamflow range is between 300-1000 cfs, and the class rating is IV-V. The most challenging section of the river is the three-mile stretch from Charlton Peak to the confluence with Plunge Creek, characterized by steep drops, tight turns, and boulder gardens. Permits are required to run the river, and there are specific regulations to the area.