The Mad River (Segment 1) is a popular whitewater river run located in Northern California. The ideal streamflow range for this river run is between 800 and 2,000 cubic feet per second (cfs). The class rating of this segment is class III to IV, which makes it suitable for intermediate to advanced level whitewater enthusiasts.

This segment of the Mad River is approximately 10 miles long and includes several challenging rapids and obstacles such as Pinball, Triple Threat, and Mergatroid. These rapids offer exciting and challenging experiences for adventurous rafters and kayakers.

In terms of regulations, the Mad River (Segment 1) is managed by the Bureau of Land Management and requires a permit to access. Additionally, the use of personal flotation devices (PFDs) is mandatory for all participants. It is also recommended that participants have proper safety equipment and experience in whitewater rafting.

Overall, the Mad River (Segment 1) provides a thrilling whitewater experience for those seeking a challenging adventure. It is important to follow all regulations and guidelines to ensure the safety of all participants.