The Devil Canyon Tributary to San Mateo Creek in California is a popular whitewater river run. The ideal streamflow range for this river is between 400 and 1500 cfs. This range ensures that the rapids are challenging enough for experienced kayakers, but also safe enough for intermediate-level paddlers. The segment mileage of this run is approximately 6 miles.

The Devil Canyon Tributary to San Mateo Creek is rated as a class IV-V run, which means that it is suitable for experienced and expert paddlers only. The rapids on this run include tight drops and steep chutes, making it a challenging run even for experienced paddlers. Some of the specific rapids and obstacles to watch out for include the "Killer Bee," "Kamikaze," and "Toad's Tongue."

There are specific regulations that apply to this area. The use of personal flotation devices (PFDs) is mandatory, and all paddlers must have the necessary safety equipment, such as a helmet and a throw rope. Additionally, paddlers are required to obtain a permit from the Cleveland National Forest in order to access the river.

In conclusion, the Devil Canyon Tributary to San Mateo Creek is a challenging and exciting whitewater river run in California. The ideal streamflow range is between 400 and 1500 cfs, and the run is rated as a class IV-V. Paddlers must be experienced and equipped with the necessary safety equipment, and a permit is required to access the river.