The Cosumnes River, located in Northern California, offers a challenging whitewater river run from Cosumnes Mine Road to the confluence with Steely Fork. This section of the river is rated Class III-IV and has a total segment mileage of 10.5 miles. The ideal streamflow range for this section is between 700-2,000 cubic feet per second (cfs), which usually occurs during the spring snowmelt or after a heavy rain.

Some of the notable rapids and obstacles on this section of the river include Meatgrinder, Troublemaker, and the infamous Swimmer's Rapid, which requires expert navigation skills. It is important to note that this section of the river is recommended for experienced whitewater kayakers and rafters only.

There are specific regulations to the area, including a mandatory vehicle shuttle and camping permit. Additionally, visitors must follow Leave No Trace principles and pack out all trash and waste. It is also important to be aware of the various private landowners along the river and to respect their property and privacy.

Overall, the Cosumnes River run from Cosumnes Mine Road to the confluence with Steely Fork offers a thrilling and challenging whitewater experience for experienced paddlers. However, proper preparation and adherence to regulations are essential for a safe and enjoyable trip.